RS-422/RS-449/RS-485/RS-530
RS-422, RS-485 and ITU V.11 define electrical properties of differential signals but not connector type or
pin assignments. Configure a port to RS-422/485/530 to use all differential signals.
RS-530 defines differential signals on a DB-25 connector. Use a straight through 25 conductor DB-25M
to DB-25F cable, such as MicroGate Part # CMF000.
RS-449 defines differential signals on a DB-37 connector. Use MicroGate RS-449 cable (Part # 2537FM).
Maximum data rate is 10Mbps. Cable length and signal loading may reduce the maximum data rate.
RS-422/RS-530/RS-449 Male DTE
Signal
Electrical
HD-26 Pin
DB-25/RS-530 Pin
DB-37/RS-449 Pin
Direction
TxD (-/A), Transmit Data
RS-422/V.11
8
2
4
Output
RxD (-/A), Receive Data
RS-422/V.11
17
3
6
Input
RTS (-/A), Request to Send
RS-422/V.11
1
4
7
Output
CTS (-/A), Clear to Send
RS-422/V.11
24
5
9
Input
DSR (-/A), Data Set Ready
RS-422/V.11
19
6
11
Input
Signal Ground
14
7
19
DCD (-/A), Data Carrier Detect
RS-422/V.11
22
8
13
Input
RxC (+/B), Receive Clock
RS-422/V.11
11
9
26
Input
DCD (+/B), Data Carrier Detect
RS-422/V.11
21
10
31
Input
AuxClk (+/B), DTE Clock Output
RS-422/V.11
7
11
35
Output
TxC (+/B), Transmit Clock
RS-422/V.11
26
12
23
Input
CTS (+/B), Clear to Send
RS-422/V.11
23
13
27
Input
TxD (+/B), Transmit Data
RS-422/V.11
9
14
22
Output
TxC (-/A), Transmit Clock
RS-422/V.11
25
15
5
Input
RxD (+/B), Receive Data
RS-422/V.11
18
16
24
Input
RxC (-/A), Receive Clock
RS-422/V.11
10
17
8
Input
LL, Local Loopback Control
RS-232/V.28
13
18
10
Output
RTS (+/B), Request to Send
RS-422/V.11
2
19
25
Output
DTR (-/A), Data Terminal Ready
RS-422/V.11
3
20
12
Output
RL, Remote Loopback Control
RS-232/V.28
12
21
14
Output
DSR (+/B), Data Set Ready
RS-422/V.11
20
22
29
Input
DTR (+/B), Data Terminal Ready
RS-422/V.11
4
23
30
Output
AuxClk (-/A), DTE Clock Output
RS-422/V.11
6
24
17
Output
RS-530 Cable (Part# CMF000)
RS-449 Cable (Part# 2537FM)
