Expansion/Isolation Module User Guide
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21
RS-232
TX: Transmit Data
RX: Receive Data
RS-422
TXD+:
Transmit Data Positive
TXD-: Transmit Data Negative
RXD+:
Receive Data Positive
RXD-:
Receive Data
Negative
RS-485
N+: Data Signal Positive
N-:
Data Signal Negative
Switch Setting
Port
A
B
C
D
E
F
G
H
Switch SW2
SW2
SW2 SW2
SW1
SW1
SW1
SW1
Bit
1,2
3,4
5,6
7,8
1,2
3,4
5,6
7,8
Mode switch setting
DIP Switch Bit 1,3,5,7
DIP Switch Bit 2,4,6,8
Interface Mode
ON
ON
RS-232
ON
OFF
RS-232
OFF
ON
RS-422
OFF
OFF
RS-485
SW2
SW1
RS232
ON
1
3
5
7
1
3
5
7
422/485
OFF
A
B
C
D
E
F
G
H
SW2
SW1
RS422
ON
2
4
6
8
2
4
6
8
RS485
OFF
A
B
C
D
E
F
G
H
Summary of Contents for cPCI-3938
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