Pin
Function Pin
Function
1
NC
20
RI2
2
DCD2
21
DTR2
3
GND
22
DSR2
4
CTS2
23
RTS2
5
RXD2
24
TXD2
6
RI3
25
DCD3
7
DTR3
26
GND
8
DSR3
27
CTS3
9
RTS3
28
RXD3
10
TXD3
29
RI1
11
DCD1
30
DTR1
12
GND
31
DSR1
13
CTS1
32
RTS1
14
RXD1
33
TXD1
15
RI0
34
DCD0
16
DTR0
35
GND
17
DSR0
36
CTS0
18
RTS0
37
RXD0
19
TXD0
Optional
Accessories
Serial
cable:
CM37M9x4
‐
60
4
‐
port
male
DB37
to
male
DB9
connection
cable,
60cm
DB9
RS
‐
232
RS
‐
422
RS
‐
485
RS485
Pin
(4
‐
wire)
(2
‐
wire)
1
DCD
TxD
‐
(A)
TxD
‐
(A)
Data
‐
(A)
2
RxD
TxD+(B)
TxD+(B)
Data+(B)
3
TxD
RxD+(B)
RxD+(B)
4
DTR
RxD
‐
(A)
RxD
‐
(A)
5
GND
GND
GND
GND
6
DSR
RTS
‐
(A)
7
RTS
RTS+(B)
8
CTS
CTS+(B)
9
CTS
‐
(A)
Serial
cable:
