Serial port connections 21, Port pin-outs 21.1.1 – Westermo MR Series User Manual
Page 429
429
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Serial Port Connections
21
MR-200, MR-250, DR-250
21.1
Port Pin-Outs
21.1.1
RS-232
25-way D
13
25
14
1
Description
RS232 signal Direction1 Pin #
Transmit Data
TxD
in
2
Receive Data
RxD
out
3
Ready To Send
RTS
in
4
Clear To Send
CTS
out
5
Data Set Ready
DSR
out
6
Ground
GND
n/a
7
Data Carrier Detect
DCD
out
8
Transmitter Clock
TxC
out
15
Receiver Clock
RxC
out
17
Data Terminal Ready
DTR
in
20
Ring Indicate
RI
out
22
External Transmitter Clock
ETC
in
24
X.21 (RS-422)
25-way D
13
25
14
1
Description
X.21 signal
Direction1 Pin #
Transmit Data (A)
TxDA
in
2
Receive Data (A)
RxDA
out
3
Control (A)
CTLA
in
4
Indication (A)
INDA
out
5
Ground
GND
n/a
7
Clock In (B)
CLKIB
out
9
Clock Out (B)
CLKOB
in
11
Indication (B)
INDB
out
13
Transmit Data (B)
TxDB
in
14
Receive Data (B)
RxDB
out
16
Clock In (A)
CLKIA
out
17
Control (B)
CTLB
in
19
Clock Out (A)
CLKOA i
n
24