Rev. 2.1 - April 2008 - ETH_CPU-1421_USM21-2008- 04
CP
U
-
142
1
User Manual
2 Introduction
CPU-1421 User Manual
Disclaimer
The information in this manual has been carefully checked and is believed to be accurate. Eurotech assumes no
responsibility for any infringements of patents or other rights of third parties, which may result from its use.
Eurotech assumes no responsibility for any inaccuracies that may be contained in this document. Eurotech makes no
commitment to update or keep current the information contained in this manual.
Eurotech reserves the right to make improvements to this document and/or product at any time and without notice.
Warranty
This product is supplied with a limited warranty. The product warranty covers failure of any Eurotech manufactured
product caused by manufacturing defects. Eurotech will make all reasonable effort to repair the product or replace it with
an equivalent alternative. Eurotech reserves the right to replace the returned product with an alternative variant or an
equivalent fit, form and functional product. Delivery charges will apply to all returned products.
Trademarks
All trademarks, both marked and not marked, appearing in this document are the property of their respective owners.
WEEE
The information below is issued in compliance with the regulations as set out in the 2002/96/CE directive, subsequently
superseded by 2003/108/CE. It refers electrical and electronic equipment and the waste management of such products.
When disposing of a device, including all of its components, subassemblies and materials that are an integral part of the
product, you should consider the WEEE directive.
This symbol has been attached to the equipment or, if this has not been possible, on the packaging,
instruction literature and/or the guarantee sheet. By using this symbol, it states that the device has been
marketed after August 13th 2005, and implies that you must separate all of its components when possible,
and dispose of them in accordance with local waste disposal legislations.
• Because of the substances present in the equipment, improper use or disposal of the refuse can
cause damage to human health and to the environment.
• With reference to WEEE, it is compulsory not dispose of the equipment with normal urban refuse,
arrangements should be instigated for separate collection and disposal.
• Contact your local waste collection body for more detailed recycling information.
• In case of illicit disposal, sanctions will be levied on transgressors.
RoHS
This device, including all it components, subassemblies and the consumable materials that are an integral part of the
product, has been manufactured in compliance with the European directive 2002/95/EC known as the RoHS directive
(Restrictions on the use of certain Hazardous Substances). This directive targets the reduction of certain hazardous
substances previously used in electrical and electronic equipment (EEE).
© 2008 Eurotech Spa
Eurotech S.p.A.
A member of the Eurotech Group
Via Fratelli Solari, 3/a
33020 - AMARO (UD)
ITALY
Introduction 3
CPU-1421 User Manual
Introduction
Manual Conventions
The following conventions are used throughout this manual.
The “Mode” of the register:
Symbol / Text Definition
RW Readable and Writable register
RO Read only register
W Meaning of the register when written
R Meaning of the register when read
Hexadecimal numbering:
Hexadecimal numbers are indicated with an “h” suffix (for example: 11Ch)
Symbols and Text used in Pin-out tables:
Symbol / Text Definition
◄ Input
► Output
◄► Bi-Directional
▬ Passive
Module specific Dependent on module installed
NC Not Connected
Reserved Use reserved to Eurotech, must remain unconnected
# Active low signal
Warnings and Important Notices:
Within this manual you will find the following tables, please ensure that you read and understand these as
they are intended to highlight potential risks or precautions that should be taken.
Warnings:
Information to alert you to potential hazards:
Potential personal injury or damage to a system, device or program.
Information notes:
Indicates important features or instructions that should be observed
4 Introduction
CPU-1421 User Manual
Technical Assistance
If you have any technical questions or if you cannot isolate a problem with your device, please e-mail the
Eurotech Technical Support Team: email: techsupp@eurotech.it
RMA Requests
Before returning any Eurotech product, for any reason, you must e-mail the Eurotech Technical Support
Team on the above email address, giving the following information; you will then be sent an RMA number
(Returned Material Authorization) for the return of the material:
• Model number (see Figure 1)
• Serial num
be
r (see Figure 1)
• Detailed fault descri
ption
• Company Details
• Contact details
Transportation
When transporting any module or system, for any reason, it should be packed using anti-static material and
placed in a sturdy box with enough packing material to adequately cushion it.
Warnings:
Any product returned to Eurotech that is damaged due to inappropriate packaging will
not be covered by the warranty!
Board labelling
On the external side of the ISA Bus connector, you will find several labels displaying the following:
• Batch Number
• Serial Number
• Model Number
• Hardware Revision
Note:
The actual location of these labels may vary depending on the product purchased.
For example: If no ISA bus is present, the PCI bus may be used instead.
However, the labelling formats will remain the same.
Figure 1. Board label locations
Serial Number
Model Number Hardware Revision
Batch Number
Table of Contents
Introduction...................................................................................................................................................... 3
Manual Conventions.......................................................................................................................................... 3
Technical Assistance......................................................................................................................................... 4
RMA Requests.........................................................................................................................................................4
Transportation.......................................................................................................................................................... 4
Board labelling.........................................................................................................................................................4
Table of Contents ............................................................................................................................................ 5
Chapter 1 Product Overview ...................................................................................................................... 7
Product Definition .............................................................................................................................................. 8
Electrical and Environmental Specifications...................................................................................................... 9
Operating Characteristics ........................................................................................................................................9
Absolute Maximum Ratings.....................................................................................................................................9
MTBF.......................................................................................................................................................................9
Chapter 2 Jumpers .................................................................................................................................... 11
Jumper Layout and Configuration ................................................................................................................... 11
Chapter 3 Connectors ............................................................................................................................... 13
Connector Layout ............................................................................................................................................ 13
How to connect the CPU-1421 with other PC/104 & PC/104-Plus devices: the stack assembly ................... 14
J1 and J2: the ISA Bus .................................................................................................................................... 15
The ISA BUS..........................................................................................................................................................15
J3: PCI Bus...................................................................................................................................................... 17
J4: Serial Ports 3 & 4 and Parallel/FDD .......................................................................................................... 19
Parallel/FDD section..............................................................................................................................................19
Serial ports 3 and 4 section in RS232 Mode.......................................................................................................... 20
Serial ports 3 and 4 section in RS422 Mode.......................................................................................................... 20
Serial ports 3 and 4 section in RS485 Mode.......................................................................................................... 20
J5: Serial Ports 1 & 2, Ethernet 2, 2 Timers, WD and GPI/O.......................................................................... 21
Timers....................................................................................................................................................................22
Watchdog Status....................................................................................................................................................22
General Purpose I/O (GPIO).................................................................................................................................. 22
Ethernet 2 ..............................................................................................................................................................22
J6: Keyboard, Speaker, Mouse and Battery.................................................................................................... 23
Keyboard ...............................................................................................................................................................23
Mouse.................................................................................................................................................................... 23
System reset.......................................................................................................................................................... 23
External Battery Input ............................................................................................................................................23
Speaker Output......................................................................................................................................................24
J7: IDE / DOM.................................................................................................................................................. 24
J8: Auxiliary Power Connector ........................................................................................................................ 25
J12: Ethernet 1 ................................................................................................................................................ 26
Chapter 4 The Setup Program.................................................................................................................. 27
Main menu.............................................................................................................................................................27
Sub menu ..............................................................................................................................................................27
Navigation / Input options ......................................................................................................................................27
Navigation Keys:.............................................................................................................................................. 28
General: ........................................................................................................................................................... 29
Devices: ........................................................................................................................................................... 30
Communications: ............................................................................................................................................. 31
ATAPI Units: .................................................................................................................................................... 32
PCI & ISA......................................................................................................................................................... 33
Advanced:........................................................................................................................................................ 34
6 Table of Contents
CPU-1421 User Manual
Error Handling:................................................................................................................................................. 35
Quit: ................................................................................................................................................................. 36
Chapter 5 BTOOL Program and Solid State Disk................................................................................... 37
The BTOOL program....................................................................................................................................... 37
OPTIONS:..............................................................................................................................................................38
The Integrated Solid State Disk....................................................................................................................... 40
Chapter 6 Virtual Peripheral ..................................................................................................................... 41
How “Virtual Peripheral” works........................................................................................................................ 42
Choosing the Virtual Peripheral connection type ............................................................................................ 42
Serial Connection:..................................................................................................................................................42
Parallel Connection:...............................................................................................................................................43
The VP2000.EXE program .............................................................................................................................. 44
How to perform a Virtual Peripheral session ................................................................................................... 45
To perform a Virtual Peripheral session you need:................................................................................................ 45
Follow these steps to perform a Virtual Peripheral session: ..................................................................................45
Chapter 7 Watchdog Timer....................................................................................................................... 47
Watchdog modes............................................................................................................................................. 47
BIOS INT 52h - functions 0Ch, 0Dh, 0Eh...............................................................................................................47
Super I/O registers programming...........................................................................................................................48
Watchdog time-out pin..................................................................................................................................... 49
Appendix ........................................................................................................................................................ 51
A.1. Mechanical Dimensions........................................................................................................................ 51
A.2. Memory Map......................................................................................................................................... 52
A.3. Manual Revision History....................................................................................................................... 52
Chapter 1 Product Overview
The CPU-1421 is a highly integrated 5x86 class PC/104-Plus computer, based on the AMD Élan SC520 133
MHz processor.
Related Products Available:
• Development kit
• RJ45 Ethernet 10/100 adapter
• Second RJ45 Ethernet 10/100 adapter
• Cable set
For a complete list of our products visit our website: www.eurotech.it
You will find a brief de
scri
ption of the CPU-1421 characteristics in the following paragraphs.
8 Product Overview
CPU-1421 User Manual
Product Definition
Architecture:
PC PCI-Architecture with ISA-bus
Dimensions:
Compliant with the PC/104-Plus standard
Processor:
AMD™ Élan™ SC520 133 MHz
Memory:
64 or 128 MB SDRAM soldered onboard
Solid State Disk:
Disk-On-Module, Compact Flash or ATA Flash
Operating System:
WinCE® and Linux®
BIOS Flash:
1 Mbyte 8-bit +5V Flash EPROM
Interfaces:
• IDE controller
• Floppy controller
• 2x 10/100 Mbit Ethernet controllers
• 4x 16C550 compatible serial ports:
− 2 software configurable as RS232, RS485 or RS422
− 2 RS-232 fixed
• Parallel port (bi-directional EPP-ECP)
• 2x 16 bit user Counter/Timers
• AT keyboard
• PS/2 mouse
Bus:
PCI/ISA PC/104-Plus compliant (ISA-bus with limitations)
Power Supply:
+5V only
Product Overview 9
CPU-1421 User Manual
Electrical and Environmental Specifications
Operating Characteristics
Electrical Operating Characteristics
Power supply Nominal 5.00V
Minimum 4.75V
Maximum 5.25V
Power consumption Typical 4.6W (0.92A @ +5V)
Backup Battery Characteristics
No configuration data is saved by the BIOS for the CMOS Real Time Clock. Therefore, the CPU module
does not need a battery except for applications that need to retain date and time data when powered off.
Battery Voltage Nominal 3.3V
Minimum 3.0V
Maximum 3.6V
Note:
Setup data is stored in the BIOS Flash EPROM; therefore, it is impossible to lose the
setup data due to power failure.
Operating Temperature Range
For correct operation of the module, the ambient air temperature must remain within the following range:
Standard Minimum +0 °C
Maximum +60 °C
Extended Minimum -40 °C
Maximum +85 °C
Absolute Maximum Ratings
Supply Voltage (Vcc) Minimum 0.00V
Maximum 5.25V
Storage Temperature Range Minimum -40 °C
Maximum +85 °C
Non-Condensing Relative Humidity <95% at 40°C
Warning:
Stressing the module beyond the “Absolute Maximum Ratings” may cause permanent damage.
These are stress ratings only. Operation beyond the “Operating Conditions” is not recommended.
Extended exposure beyond the “Operating Conditions” may affect device reliability
MTBF
Hours 231000
Standard GB 25
(This page is intentionally left blank.)
Chapter 2 Jumpers
Jumper Layout and Configuration
Jumpers are shown as JP followed by its designated number.
JP3
JP1
JP2
Figure 2. Jumper layout
PIN Type Function Settings Default
JP1 2 pin External Bios Open: Module starts with internal BIOS
Closed: Module starts with External Bios
Open
JP2 2 pin Invalid Setup Open: Module starts with saved parameters
Closed: Module starts with default settings
Open
JP3 2 pin Module Reset Open: Normal operation
Closed: System will be reset
Open
JP4 2 pin Reserved - Open
JP5 3 pin Ethernet Controller 1-2: Ethernet 1 Disabled
2-3: Ethernet 2 Disabled
Open: Ethernet 1 and Ethernet 2 Enabled
Open
Table 1. Jumper Functions
(This page is intentionally left blank.)
Chapter 3 Connectors
Connector Layout
Connectors are shown as J followed by its designated number and a red pad indicates pin 1.
J5 J4
J8
J1 J2
J3
J12
Figure 3. Connector layout
Connector # Function Qty of pins Format Pitch (mm)
J1 ISA Bus 64 PC104: 32x2 2.54
J2 ISA Bus 40 PC104: 20x2 2.54
J3 PCI Bus 120 PC104PLUS: 30x4 2.00
J4 Serial Port 3 & 4, Parallel/FDD 40 PINSTRIP 20X2 SMT 1.25
J5
Serial Port 1 & 2, Timer, Watchdog Status,
GPI/O and Ethernet 2
40 PINSTRIP 20X2 SMT 1.25
J6 Keyboard, Mouse, Speaker and Battery 18 Pin strip 9x2 2.00
J7 IDE/DOM 44 Pin strip 22x2 2.00
J8 Auxiliary power supply input 12 Pin strip 6x2 2.54
J12 Ethernet 1 8 SIL 8 2.00
Figure 4. Connector functions
14 Connectors
CPU-1421 User Manual
How to connect the CPU-1421 with other PC/104 & PC/104-Plus
devices: the stack assembly
The ISA and PCI bus connectors of the module are designed to allow it to be connected with other PC/104
and/or PC/104-Plus devices, we recommend users to follow this procedure to ensure that stacked modules
are not damaged.
The CPU module must be the top module because it does not allow the connection of other modules above
it (it does not include any connector on the upper side).
Warning:
Appropriate ESD (Electro Static Discharge) precautions should be used for the following
procedure.
1. Turn off the power to the PC/104 (or PC/104-Plus) system or stack.
2. Select and install standoffs as required to correctly position the module on the PC/104 stack.
3. Remove the module from its anti-static bag.
4. Check that keying pins in the bus connector are correctly positioned.
5. Check the stacking order; make sure an XT bus card will not be placed between two AT bus cards or
it will interrupt the AT bus signals.
6. Hold the module by its edges and orient it so that the bus connector pins line up with the matching
connector on the stack.
7. Press the module evenly onto the PC/104 stack.
Figure 5 shows a typical module stack with two PC/104 modules, one PC/104 16-BIT module, and one
PC/104 8
-
BIT module.
The maximum number of modules is four in addition to the Host Board.
0.6 in. (15mm) Spacers (4 plcs.)
Stackthrough
8-bit module
0.435 in. (11 mm)
0.6 in. (15 mm)
Stackthrough
16-bit module
Stackthrough
PC/104Plus module
Non-Stackthrough
PC/104Plus module
0.6 in. (15mm) Spacers (4 plcs.)
0.6 in. (15mm) Spacers (4 plcs.)
0.100 in. (2.54 mm)
0.062 in. (1.57 mm)
Figure 5. The Module Stack
Warning:
Do not force the module onto the stack! Wiggling the module or applying too much pressure may
damage it. If the module does not readily press into place, remove it, check for bent pins or out-of-
place keying pins, and try again.
Connectors 15
CPU-1421 User Manual
J1 and J2: the ISA Bus
The ISA BUS
Connectors J1 and J2 carry the signals for the ISA Bus.
These signals match definitions of the IEEE P996 standard.
Below is shown a picture of the ISA BUS
J2
J1
Figure 6. ISA BUS layout
According to the PC/104 specifications, these connectors include KEY pins; these are filled holes in the
upper side and missing pins in the lower side of the bus. This is done to avoid the wrong insertion in/of
another module.
Unsupported ISA Bus Functions
The following ISA bus features are not supported.
Because the CPU itself does not support address pipelining, address pipelining is not supported on the
ISA bus.
External master access is not supported, and the CPU is always the master on the ISA bus (external
masters can be accommodated by the PCI bus).
“GPIOCS16” and “GPMEMCS16” do not cause the ISA bus timings to change for the bus cycles during
which these signals are asserted.
“IOCHRDY” is supported only as an input for the slave devices that require wait states. Since there is no
external master support, “IOCHRDY” is not supported as an output.
“IOCHK” is not supported.
The REFRESH pin is not supported.
“NOWS” is not supported.
IRQ15 is not supported. By customer request, a special setting can be made to support IRQ15; however,
that would make IRQ9 unavailable. The factory can only perform this special setting.
The ISA bus interface timing is configured to support most ISA bus devices. However, the CPU-1421’s
ISA bus does not support all legacy ISA timing.
16 Connectors
CPU-1421 User Manual
Pin # Use Signal Pin # Use Signal
1 ISA Bus IOCHK# 33 ISA Bus A14
2 ISA Bus Ground 34 ISA Bus DACK1#
3 ISA Bus D7 35 ISA Bus A13
4 ISA Bus RSTDRV 36 ISA Bus DRQ1
5 ISA Bus D6 37 ISA Bus A12
6 ISA Bus +5 Volts 38 ISA Bus REFRESH#
7 ISA Bus D5 39 ISA Bus A11
8 ISA Bus IRQ 9 40 ISA Bus ISACLK
9 ISA Bus D4 41 ISA Bus A10
10 ISA Bus -5 Volts 42 ISA Bus IRQ 7
11 ISA Bus D3 43 ISA Bus A9
12 ISA Bus DRQ2 44 ISA Bus IRQ 6
13 ISA Bus D2 45 ISA Bus A8
14 ISA Bus -12 Volts 46 ISA Bus IRQ 5
15 ISA Bus D1 47 ISA Bus A7
16 ISA Bus ZEROWS# 48 ISA Bus IRQ 4
17 ISA Bus D0 49 ISA Bus A6
18 ISA Bus +12 Volts 50 ISA Bus IRQ 3
19 ISA Bus IOCHRDY 51 ISA Bus A5
20 Not Connected Key 52 ISA Bus DACK2#
21 ISA Bus AEN 53 ISA Bus A4
22 ISA Bus SMEMW# 54 ISA Bus TC
23 ISA Bus A19 55 ISA Bus A3
24 ISA Bus SMEMR# 56 ISA Bus BALE
25 ISA Bus A18 57 ISA Bus A2
26 ISA Bus IOW# 58 ISA Bus +5 Volts –1
27 ISA Bus A17 59 ISA Bus A1
28 ISA Bus IOR# 60 ISA Bus OSC
29 ISA Bus A16 61 ISA Bus A0
30 ISA Bus DACK3# 62 ISA Bus Ground 1
31 ISA Bus A15 63 ISA Bus Ground 3
32 ISA Bus DRQ3 64 ISA Bus Ground 2
Table 2. J1 pinout
Pin # Use Signal Pin # Use Signal
1 ISA Bus Ground 0 21 ISA Bus MEMW#
2 ISA Bus Ground 1 22 ISA Bus DACK5#
3 ISA Bus SBHE# 23 ISA Bus SD8
4 ISA Bus ISA_MEMCS16# 24 ISA Bus DRQ5
5 ISA Bus LA23 25 ISA Bus SD9
6 ISA Bus IOC16# 26 ISA Bus DACK6#
7 ISA Bus LA22 27 ISA Bus SD10
8 ISA Bus IRQ10 28 ISA Bus DRQ6
9 ISA Bus LA21 29 ISA Bus SD11
10 ISA Bus IRQ11 30 ISA Bus DACK7#
11 ISA Bus LA20 31 ISA Bus SD12
12 ISA Bus IRQ12 32 ISA Bus DRQ7
13 ISA Bus LS19 33 ISA Bus SD13
14 ISA Bus IRQ15 34 ISA Bus +5 Volts
15 ISA Bus LA18 35 ISA Bus SD14
16 ISA Bus IRQ14 36 ISA Bus MASTER#
17 ISA Bus LA17 37 ISA Bus SD15
18 ISA Bus DACK0# 38 ISA Bus Ground 2
19 ISA Bus MEMR# 39 ISA Bus NC
20 ISA Bus DRQ0 40 ISA Bus Ground 3
Table 3. J2 pinout
Connectors 17
CPU-1421 User Manual
J3: PCI Bus
Connector J3 carries the PCI Bus signals. The PCI Bus mechanical interface is a stackable 30x4 header.
This interface carries all of the required PCI signals as per PCI Local Bus Specification Version. 2.1.
PCI Bus
J3
Figure 7. PCI BUS layout
Unsupported PCI Bus Functions
The following list summarizes some of the PCI bus functionalities that are not supported in the
CPU-1421’s PCI host bridge. These functions are listed as optional in the PCI bus specification.
66 MHz is not supported.
64 bit data is not supported
64 bit addressing (dual address cycles) is not supported due to the maximum 32 bit address space of the
Am5
x86 CPU.
Cacheable PCI bus memory (SBDONE, SBO) is not supported.
The optional “CLKRUN” pin is not supported.
The “LOCK” pin is an optional pin not required in most systems, because other mechanisms are typically
employed for coherency.
Address/data stepping is not supported as a master due to the performance implications.
The CPU does not support a downstream “Southbridge” device, because most peripherals normally
included in a Southbridge are integrated into the CPU.
The optional message-signalled interrupt feature described in the PCI Local Bus Specification, Revision
2.2, is not supported in the CPU-1421.
Unsupported PCI Bus Configuration Registers
Some standard PCI bus configuration registers are not implemented, because the CPU is a host-
to-PCI bridge and does not support some optional PCI functionality.
Base Address registers are not implemented, because the CPU is the host PCI device. Target address
space configuration is done through CPU-specific configuration.
“Latency timer” and “MAX_LAT”, “MIN_GNT” are not implemented, because the CPU’s PCI host bridge
does not support multiple data phase transactions as a master.
Cache line size is not implemented, because the CPU PCI host bridge does not support cacheable PCI
memory.
Note:
For further information regarding the ISA and PCI bus, please visit the Eurotech
website (http://www.eurotech.it/
), referring to the section titled “Industry Standards”.
18 Connectors
CPU-1421 User Manual
Pin A B C D
1 GND Reserved +5 AD00
2 VI/O AD02 AD01 +5V
3 AD05 GND AD04 AD03
4 C/BE0# AD07 GND AD06
5 GND AD09 AD08 GND
6 AD11 VI/O AD10 M66EN
7 AD14 AD13 GND AD12
8 +3.3V C/BE1# AD15 +3.3V
9 SERR# GND Reserved PAR
10 GND PERR# +3.3V Reserved
11 STOP# +3.3V LOCK# GND
12 +3.3V TRDY# GND DEVSEL#
13 FRAME# GND IRDY# +3.3V
14 GND AD16 +3.3V C/BE2#
15 AD18 +3.3V AD17 GND
16 AD21 AD20 GND AD19
17 +3.3V AD23 AD22 +3.3V
18 IDSEL0 GND IDSEL1 IDSEL2
19 AD24 C/BE3# VI/O IDSEL3
20 GND AD26 AD25 GND
21 AD29 +5V AD28 AD27
22 +5V AD30 GND AD31
23 REQ0# GND REQ1# VI/O
24 GND REQ2# +5V GNT0#
25 GNT1# VI/O GNT2# GND
26 +5V CLK0 GND CLK1
27 CLK2 +5V CLK3 GND
28 GND INTD# +5V RST#
29 +12V INTA# INTB# INTC#
30 -12V REQ3# GNT3# GND
Table 4. J3 pinout
Connectors 19
CPU-1421 User Manual
J4: Serial Ports 3 & 4 and Parallel/FDD
J4 implements the following functions:
• Parallel/FDD port (see also The Setup Program)
• Serial ports 3
and 4 (RS232, RS422 or RS485 selectable; see also The Setup Program)
Note:
For further information, refer to the Application notes An0066
and An0067 that can
be downloaded from www.eurotech.it
.
Figure 8. J4 Layout
Pin # Port Signal Pin # Port Signal
1 Parallel STROBE# 2 Parallel PE
3 Parallel PD0 4 Parallel SLCT
5 Parallel PD1 6 Parallel GND1_LPT
7 Parallel PD2 8 Parallel AUTOFD#
9 Parallel PD3 10 Parallel GND2_LPT
11 Parallel PD4 12 Parallel ERROR#
13 Parallel PD5 14 Parallel GND3_LPT
15 Parallel PD6 16 Parallel INIT#
17 Parallel PD7 18 Parallel GND4_LPT
19 Parallel ACK# 20 Parallel SLCTIN#
21 Parallel BUSY 22 - Not Connected
23 Serial 3 DCD 24 Serial 3 DSR
25 Serial 3 RX 26 Serial 3 RTS
27 Serial 3 TX 28 Serial 3 CTS
29 Serial 3 DTR 30 Serial 3 RI
31 Serial 3 GND 32 Serial 4 GND
33 Serial 4 DCD 34 Serial 4 DSR
35 Serial 4 RX 36 Serial 4 RTS
37 Serial 4 TX 38 Serial 4 CTS
39 Serial 4 DTR 40 Serial 4 RI
Table 5. J4 pinout
Parallel/FDD section
The user can choose the Parallel port or the FDD setting using the Setup Program.
20 Connectors
CPU-1421 User Manual
Serial ports 3 and 4 section in RS232 Mode
Pin # Port Signal Function Pin # Port Signal Function
23 Serial 3 DCD Data Carrier detect 24 Serial 3 DSR Data Set Ready
25 Serial 3 RX Receive Data 26 Serial 3 RTS Request To Send
27 Serial 3 TX Transmit Data 28 Serial 3 CTS Clear To Send
29 Serial 3 DTR Data Terminal Ready 30 Serial 3 RI Ring Indicator
31 Serial 3 GND Ground 32 Serial 4 GND Ground
33 Serial 4 DCD Data Carrier detect 34 Serial 4 DSR Data Set Ready
35 Serial 4 RX Receive Data 36 Serial 4 RTS Request To Send
37 Serial 4 TX Transmit Data 38 Serial 4 CTS Clear To Send
39 Serial 4 DTR Data Terminal Ready 40 Serial 4 RI Ring Indicator
Serial ports 3 and 4 section in RS422 Mode
Pin # Port Signal Function In/Out
23 Serial 3 -TX Transmit Data - Out
25 Serial 3 +TX Transmit Data + Out
27 Serial 3 -RX Receive Data - In
29 Serial 3 +RX Receive Data + In
31 Serial 3 GND Ground --
32 Serial 4 GND Ground --
33 Serial 4 -TX Transmit Data - Out
35 Serial 4 +TX Transmit Data + Out
37 Serial 4 -RX Receive Data - In
39 Serial 4 +RX Receive Data + In
Pins not shown in the table are not connected
Serial ports 3 and 4 section in RS485 Mode
Pin # Port Signal Function In / Out
23 Serial 3 -TX/-RX Transmit/Receive data - In / Out
25 Serial 3 +TX/+RX Transmit/Receive data + In / Out
31 Serial 3 GND Ground --
32 Serial 4 GND Ground --
33 Serial 4 -TX/-RX Transmit/Receive data - In / Out
35 Serial 4 +TX/+RX Transmit/Receive data + In / Out
Pins not shown in the table are not connected
Note:
If the Serial port is used in RS485 mode, the bi-directional line must be controlled via
software, using the Data Terminal Ready (DTR) signal of the serial controller.
This signal is defined by bit 0 of the UART Modem Control Register (MCR) and the bi-
directional line is controlled as follows:
- Bit 0 of the MCR register = 0 means RS485 line receiving
- Bit 0 of the MCR register = 1 means RS485 line transmitting
The I/O address of the MCR is "Serial port Base address" +4H.
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