Black Box ME540A-ST Specification
- Category
- AV extenders
- Type
- Specification
Black Box ME540A-ST enables extension of RS-232, RS-485, or 20mA current loop devices over fiber optic cable, supporting various configurations like network, master/slave, or point-to-point modes. It offers speeds up to 20Kbps on the 20mA current loop port, 64Kbps on the RS-232 port, and 128Kbps on the RS-485 port, with a maximum distance of 5000 feet on 62.5-micron cable.
Black Box ME540A-ST enables extension of RS-232, RS-485, or 20mA current loop devices over fiber optic cable, supporting various configurations like network, master/slave, or point-to-point modes. It offers speeds up to 20Kbps on the 20mA current loop port, 64Kbps on the RS-232 port, and 128Kbps on the RS-485 port, with a maximum distance of 5000 feet on 62.5-micron cable.
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
CUSTOMER
SUPPORT
INFORMATION
FEBRUARY 1998
ME540A-ST
ME540A-SM
FOM Line Driver—ST
FOM Line Driver—SM
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de
classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par le ministère des Communications du Canada.
INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)
FOM LINE DRIVER—ST AND SM
3
Contents
Chapter Page
FOM LINE DRIVER—ST AND SM
4
Protocol —
Speed —
Maximum Distance —
Operation —
No. of Drops Supported —
Interface —
Connectors —
Indicators —
User Controls —
Link Budget —
Fiber Launch Power —
Receiver Sensitivity —
Wavelength —
Cable Requirements —
MTBF —
Relative Humidity Tolerance —
Operating Temperature —
Storage Temperature —
Power —
Size —
Weight —
1. Specifications
FOM LINE DRIVER—ST AND SM
5
2.1 Ports
2.2 Speed and Distance
Figure 2-1. The FOM Line Driver.
CONNECTORS
TX RX
CONNECTORS
TX RX
DB-9
TERMINAL
BLOCK
WALLMOUNT
POWER SUPPLY
2. Introduction
FOM LINE DRIVER—ST AND SM
6
3.1 Network Mode
NOTE
There is no collision detection.
Figure 3-1. All units configured in network mode.
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
3. Configurations
Fiber
Cabling
232/485/C. Loop
Receiving
Receiving
232/485/C. Loop
Receiving
Transmitting
232/485/C. Loop
Transmitting
Receiving
232/485/C. Loop
Receiving
Receiving
Data
Path
FOM LINE DRIVER—ST AND SM
7
3.2 Master/Slave Mode
Figure 3-2. One unit configured as a master, all others as slaves.
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
ABABABAB
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
BA BA B BAA
Fiber
Cabling
Master
Transmitting
Receiving
Master Slave Slave Slave
Slave
Receiving
Receiving
Slave
Receiving
Transmitting
Slave
Receiving
Receiving
Data
Path
FOM LINE DRIVER—ST AND SM
8
3.3 Point-to-Point
Figure 3-3. Point-to-point—Both units configured as masters.
NOTE
The same interface is not required on both sides.
TX
TERMINAL
BLOCK
RX
TX
RX
RX
TX
RX
TX
TX
RX
RX
TX
TERMINAL
BLOCK
FIBER OPTIC
CABLE
DB-9 DB-9
FOM LINE DRIVER—ST AND SM
9
4.1 Setup
or
S1, Position 1—Mode Select
S1, Position 2—Master/Slave Select
NOTE
To use the following switch positions appropriately, you should have a firm understanding
of your network requirements.
S1, Positions 3 through 6—RS-485 Failsafe/Biased Line
S1, Positions 7 and 8—RS-485 Termination
4. Installation
KEY
0 = Open/Off
1 = Closed/On
FOM LINE DRIVER—ST AND SM
10
Fiberoptic Cable Connections
Chapter 3, Configurations
Section 4.2
Section 4.3
Section 4.4
4.2 RS-232
Set XW1.
DB9 Pinouts
DCE DTE
2—TX Data 2—RX Data
3—RX Data 3—TX Data
7—RTS Input 7—RTS Held High
4—DTR Input 4—DTR Held High
8—CTS Output 5—Signal Ground
6—DSR Held High 8—No Connect
1—CD Held High 6—No Connect
5—Signal Ground 1—No Connect
Set W3.
Set W2.
FOM LINE DRIVER—ST AND SM
11
4.3 RS-485
Connect the wire to the terminal block.
Set S5.
Set W4, W5, and W6.
For 4-wire operation:
For 2-wire operation:
Set S1.
To terminate:
Not terminated:
RXB (+)
RXA (-)
TXB (+)
TXA (-)
KEY
0 = Open/Off
1 = Closed/On
FOM LINE DRIVER—ST AND SM
12
Biased, Failsafe Operation (S1, positions 3 through 6).
NOTE
To use S1 positions 3 through 6 appropriately, you should have a firm understanding of
your network requirements.
Figure 4-1. Biased/Failsafe Operation Switches (RS-485).
Data Flow
TB1-4
TB1-1
TB1-2
TB1-3
+5V
+5V
1K
TX
RX
1K
1K
1K
Line Driver
S1 Position 3
S1 Position 4
S1 Position 5
S1 Position 6
Data Flow
FOM LINE DRIVER—ST AND SM
13
4.4 20-mA Current Loop (Point to Point)
NOTE
To use the following switch positions appropriately, you should have a firm understanding
of your network requirements.
Connect the wire to the terminal block.
Set S5.
Set S2 and S3.
S2—20-mA Current-Loop Receive
S3—20-mA Current-Loop Transmit
FOM LINE DRIVER—ST AND SM
14
Figure 5-1. Circuit board with RS-232 options.
+
+
+
+
+
-
+
+ +
+
+
+ B
- A
+ B
- A
Rx
Tx
1
2
3
4
5. Quick Setup Guide
RX A
X
W
1
B
X
W
1
A
S1
W3
CBA
W2
TX A
RX B
TX B
RX A
TX A
RX B
TX B
Slave
Master
Network
20mA
RS-485
RS-232
Loopback
Switch
KEY
0 = Open/Off
1 = Closed/On
S1
Pos. 1 = Mode Select
0 = Network Mode
1 = Master/Slave Mode
Pos. 2 = Master/Slave Select
0 = Master
1 = Slave
W3
When the unit is set to DCE (XW1A)
Pos. AB selects CTS response to DTR
Pos. BC selects CTS response to RTS
When the unit is set to DTE (XW1B), this
strap has no function
XW2A = RS-232
interface
XW1B = Sets the RS-232 interface for DTE
XW1A = Sets the RS-232 interface for DCE
RS-232 interface
(DB9 connector)
W2 = RTS/CTS delay
0 10 30 ms
FOM LINE DRIVER—ST AND SM
15
Figure 5-2. Circuit board with RS-485 options.
+
+
+
+
+
-
+
+ +
+
+
+ B
- A
+ B
- A
Rx
Tx
1
2
3
4
RX A
TX A
TX B
A
S5
S1
W6
W5
W4
B
B
AC
RX B
Slave
Master
Network
20mA
RS-485
RS-232
Loopback
Switch
RX A
RX B
TX A
TX B
KEY
0 = Open/Off
1 = Closed/On
W4 and W5
Set for the AB position = 4 wire
Set for the BC position = 2 wire
W6
When in 2-wire, this is the time
that the driver remains enabled
after the TX of the last data bit.
Delays are:
A = 7 ms
B = 2 ms
C = 0.7 ms
D = 0.15 ms
XW2B = RS-485
interface
S5 set to
B (RS-485)
RS-485
Terminal Block
S1
Pos. 1 = Mode Select
0 = Network Mode
1 = Master/Slave Mode
Pos. 2 = Master/Slave Select
0 = Master
1 = Slave
Pos. 3 & 4 = Bias TX (see pg. 9)
0 = No Bias
1 = Biased
Pos. 5 & 6 = Bias RX (see pg. 9)
0 = No Bias
1 = Biased
Pos. 7 & 8 = RS-485 Termination
0 = Unterminated
1 = Terminated
FOM LINE DRIVER—ST AND SM
16
Figure 5-3. Circuit board with 20-mA current-loop options.
+
+
+
+
+
-
+
+ +
+
+
+ B
- A
+ B
- A
Rx
Tx
1
2
3
4
RS-232
A
S3
S2
S1
A
BB
A
BC
B
A
RX B
RX A
TX B
TX A
RX A
TX A
RX B
TX B
Slave
Master
Network
20mA
Loopback
Switch
RS-232
RS-485
20-mA
Terminal Block
S5 set to
A (20mA)
XW2C = 20-mA
interface
S2 and S3
S2 Pos. A = Active RX
S2 Pos. B = Passive RX
S3 Pos. A = Active TX
S3 Pos. B = Passive TX
S1
Pos. 1 = Mode Select
0 = Network Mode
1 = Master/Slave Mode
Pos. 2 = Master/Slave Select
0 = Master
1 = Slave
KEY
0 = Open/Off
1 = Closed/On
FOM LINE DRIVER—ST AND SM
17
6.1 Application Problems
Do this before you call for technical support
6.2 Calling Your Supplier
6.3 Shipping and Packaging
6. Troubleshooting
FOM LINE DRIVER—ST AND SM
18
Application Diagram forms are found on pages 19, 21, and 23.
You may be asked to fax your diagram to the Technical Support department.
Use scissors to remove the page.
FOM LINE DRIVER—ST AND SM
19
Local Node Remote Node
XW2 XW2
XW1 XW1
W3 W3
W2 W2
S5 S5
W4 W4
W5 W5
W6 W6
S2 S2
S3 S3
S1: S1:
NOTE
0 = Open or Off
1 = Closed or On
NOTE
0 = Open or Off
1 = Closed or On
112 2334 455667 788
AABB
FOM LINE DRIVER—ST AND SM
20
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Black Box ME540A-ST Specification
- Category
- AV extenders
- Type
- Specification
Black Box ME540A-ST enables extension of RS-232, RS-485, or 20mA current loop devices over fiber optic cable, supporting various configurations like network, master/slave, or point-to-point modes. It offers speeds up to 20Kbps on the 20mA current loop port, 64Kbps on the RS-232 port, and 128Kbps on the RS-485 port, with a maximum distance of 5000 feet on 62.5-micron cable.
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