10
Serial interface
connector pin
assignment
Serial interface 1, RS 232/Current loop connector:
Pin
Direction
Name
2
out
TXD, Transmit data
3
in
RXD, Receive data
4
out
RTS, Request to send
5
in
CTS, Clear to send
6
in
DSR, Data set ready
7
-
GND, Signal ground
8
in
DCD, Data carrier detect
20
out
DTR, Data terminal ready
9
-
TX+, Current loop, transmit data +
10
-
TX-, Current loop, transmit data -
11
-
RX+, Current loop, receive data +
12
-
RX-, Current loop, receive data -
13
-
Ready+, Current loop, Ready (DCD) +
14
-
Ready-, Current loop, Ready (DCD) -
Serial interface 2, RS 485 connectors:
Pin
Name
1
DATA A, Data signal pair, signal A
2
DATA B, Data signal pair, signal B
3
RTS A, Request to send signal pair, signal A
4
RTS B, Request to send signal pair, signal B
7
GND, Power supply for optical bus connection module.
8
9
+8V, Power supply for optical bus connection module.
Serial interface 4, RS 232/Current loop connector:
Pin
Direction
Name
2
out
TXD, Transmit data
3
in
RXD, Receive data
4
out
RTS, Request to send
5
in
CTS, Clear to send
7
-
GND, Signal ground
8
in
DCD, Data carrier detect
20
out
DTR, Data terminal ready
9
-
TX+, Current loop, transmit data +
10
-
TX-, Current loop, transmit data -
11
-
RX+, Current loop, receive data +
12
-
RX-, Current loop, receive data -
13
-
Ready+, Current loop, Ready (DCD) +
14
-
Ready-, Current loop, Ready (DCD) -