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Interface RS485-TTL
v.1.0
CODE: INTR
EN
Edition: 2 from 19.12.2012
Supersedes the: 1 from 07.09.2012 edition
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CONTENTS
1. GENERAL DESCRIPTION...................................................................................................................3
2. ARRANGEMENT OF THE COMPONENTS. ....................................................................................3
3. CONNECTING TO THE RS485 BUS...................................................................................................4
3.1
S
YSTEM STRUCTURE IN THE
RS485
BUS
................................................................................................................................4
3.2
C
ONNECTING THE INTERFACE TO THE BUS
.............................................................................................................................4
3.3
T
HE
PSU
CONFIGURATION
–
ASSIGNING THE ADDRESSES
......................................................................................................5
3.3.1 Configuration of the PSU with an LCD display............................................................................................................5
3.3.2 Configuration of the PSU with an LED display. ...........................................................................................................6
4. SPECIFICATIONS.................................................................................................................................6
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Features:
• power through the ”SERIAL” outlet
• connection of the PSU of PSBEN series with the RS485 bus
• easy connection
• galvanic isolation
• communication system: half-duplex
• compliant with the PowerSecurity programming software
• LED indication
•
warranty – 5 years from the production date
1. General description.
The RS485-TTL ”INTR” interface enables connecting of the PSU of the PSBEN (Black Power) series to the
RS485 bus remaining a galvanic isolation. The communication inside the RS485 bus is due to a two-way channel,
differential in a half-duplex system where transmitting and receiving data is alternate.
2. Arrangement of the components.
The picture below shows the arrangement of the most important components and connectors of the
RS485-TTL interface on the pcb.
Fig.1. The view of the RS485-TTL interface.
Table 1. Description of the components.
Element
no.
Description
[1]
Connector of the RS485 bus:
A+, B- - RS485 data transmission
SG - signal ground
[2] TTL cable – for the connection with the PSU
[3]
LEDs – optical indication:
PWR – indication of supply’s voltage
TX – data transmission
RX – receiving data
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3. Connecting to the RS485 bus.
3.1 System structure in the RS485 bus.
Use a twisted-pair cable as a transmission wire of the bus. The bus shall be of a ”point-to-point” topology,
the ”star” type of topology is to be avoided. If the wires are of a significant length it is recommended to use a
shielded cable that will prevent from errors during communication and lowers the susceptibility to noise and
emission of radio frequency interference. It is also advisable to mount termination resistors at the ends of the bus.
Their resistance ought to be comparable to the impedance specific for the lead in use, i.e. 120 Ohm.
Shown below is a block diagram of an RS485 bus with the use of RS485-TTL interfaces housed in
enclosures of PSBEN series.
Fig. 2. A block diagram of power supplies of PSBEN series with the RS485-TTL interface
connected to the RS485 bus.
The location for mounting the interfaces has been selected inside the PSU’s enclosure. The connection
with the PSU is to be made via an additional TTL cable, included in the set with the interface. The TTL cable is to
be connected to the “SERIAL’ outlets that are located both in the interface and the pcb of the PSU. The connection
with the RS485 bus is through the “RS-485” connector that is located on the pcb of the interface. Connect the wires
of the RS485 bus to the A+, B- terminals of the connector. They are assigned in the same way and the connection
is identical to the rest of devices (A+ to A+, B- to B-).
Data conversion between the RS485 bus and the computer is implemented by a different kind of an
interface – “INTUR”, also available in the company’s product mix.
3.2 Connecting the interface to the bus.
1) Mount the RS485-TTL interface in a selected location within the PSU.
2) Connect the interface to the PSU using the additional TTL cable (included to the interface set) and
plugging it in the “SERIAL” outlets.
3) Connect the wire of the RS485 bus to the RS-485 connector of the interface. Take notice of the A+, B-
wires so that they are connected in the same manner as in other devices, i.e. A+ to A+, B- to B-. In the
case of shielded wires, the shield is to be connected to the SG signal ground terminals.
4) Optionally, mount the 120 Ohm termination resistors at the end of the RS485 bus.
5) Connect the USB-RS485 interface that converts data from the RS485 bus to a USB standard. This
interface is also available in the product mix of PULSAR company.
6) Assign an address to each PSU within the bus – chapter 3.3.
Addresses cannot be repeated.
7) Configure the connection in the PowerSecurity programming software.
Download the “PowerSecurity” program from the following page:
http://www.pulsar.pl/pl/pliki/PowerSecurity.exe
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3.3 The PSU configuration – assigning the addresses.
Communication in the RS485 bus requires setting appropriate communication parameters in all devices
and assigning unrepeatable addresses. The configuration of power supplies of the PSBEN series is via a display
located on the front panel of the enclosure. The procedure for a PSU with an LED display differs from an LCD one.
All power supplies have a preset address 1.
3.3.1 Configuration of the PSU with an LCD display.
- enter the PSU ”Settings” menu
(if the main screen is displayed, press the ”SET” button)
- with ‘>’ or ‘<’ choose the PSU menu
- confirm your choice with the ‘SET’ button
- with ‘>’ or ‘<’ choose the Comm. Address
- press the ”SET” button
- the prompt will appear at the end of the line
- with ‘>’ or ‘<’ set the address from 1 to 247.
- confirm your choice with the ‘SET’ button
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3.3.2 Configuration of the PSU with an LED display.
– press simultaneously the right and
the leftmost buttons on the LED display
- press “OK” after appearing the “Adr” string
- with ‘>’ or ‘<’ set the address from 1 to 247.
- confirm the address with the ‘OK’ button
4. Specifications.
Power supply 5V
Current consumption Max. 30mA
Transmission’s speed Max. 19200 bauds, with parity check
Galvanic isolation between the
RS485 and the TTL interfaces
1KV(DC), 700V(AC)
LED indication PWR – power’s voltage indication (red LED)
TX – data transmission (yellow LED)
RX – receiving data (green LED)
Operating conditions Temperature -10
o
C ÷ 40
o
C
Relative humidity 20%...90%
Dimensions (LxWxH) 63 x 50 x 20 [mm]
Net/gross weight 0,03kg / 0,09kg
Storage temperature -20ºC...+60ºC
Pulsar K.Bogusz Sp.j.
Siedlec 150, 32-744 Łapczyca, Polska
Tel. (+48) 14-610-19-40, Fax. (+48) 14-610-19-50
e-mail:
http:// www.pulsar.pl, www.zasilacze.pl
WEEE
MARKING
According to the EU WEE Directive – It is required not to dispose of electric or electronic waste as unsorted municipal waste and to collect
such WEEE separately.
WARRANTY
5 years counted from the device’s production date.
THE WARRANTY IS VALID only upon presentation
of the item’s proof of purchase.
/