Microgate SyncLink GT2E - Page 13

RS-422/RS-449/RS-485/RS-530
The RS-422 and RS-485 standards describe differential electrical signals but not connector or pin
assignments. The RS-530 and RS-449 standards define specific connectors and pin assignments using
differential signals. The differential signals on the card meet both RS-422 and RS-485 electrical
specifications.
RS-530 uses differential signals on a DB-25 connector. The adapter DB-25 connector follows this
standard when the port jumpers are installed for RS-422/485. Use any straight through 25 conductor
DB-25M to DB-25F cable (such as MicroGate Part # CMF000) to connect the adapter to RS-530
communications equipment.
RS-449 uses differential signals on a DB-37 connector. To use this standard install the RS-422/485
jumpers for the port and use the MicroGate RS-449 cable (Part # 2537FM).
The maximum data rate supported by the adapter when using RS-530 or RS-449 is 10Mbps. Cable length
and signal loading may reduce the maximum usable data rate from this value.
RS-422/RS-530/RS-449 Male DTE
Signal Name
Electrical Desc
DB25
RS-530
Pin #
DB37
RS-449
Pin #
Direction
Earth/Shield Ground
1
1
TxD (-/A), Transmit Data
RS-422/V.11
2
4
Output
RxD (-/A), Receive Data
RS-422/V.11
3
6
Input
RTS (-/A), Request to Send
RS-422/V.11
4
7
Output
CTS (-/A), Clear to Send
RS-422/V.11
5
9
Input
DSR (-/A), Data Set Ready
RS-422/V.11
6
11
Input
Signal Ground
7
19
DCD (-/A), Data Carrier Detect
RS-422/V.11
8
13
Input
RxC (+/B), Receive Clock
RS-422/V.11
9
26
Input
DCD (+/B), Data Carrier Detect
RS-422/V.11
10
31
Input
AuxClk (+/B), DTE Clock Output
RS-422/V.11
11
35
Output
TxC (+/B), Transmit Clock
RS-422/V.11
12
23
Input
CTS (+/B), Clear to Send
RS-422/V.11
13
27
Input
TxD (+/B), Transmit Data
RS-422/V.11
14
22
Output
TxC (-/A), Transmit Clock
RS-422/V.11
15
5
Input
RxD (+/B), Receive Data
RS-422/V.11
16
24
Input
RxC (-/A), Receive Clock
RS-422/V.11
17
8
Input
LL, Local Loopback Control
RS-232/V.28
18
10
Output
RTS (+/B), Request to Send
RS-422/V.11
19
25
Output
DTR (-/A), Data Terminal Ready
RS-422/V.11
20
12
Output
RL, Remote Loopback Control
RS-232/V.28
21
14
Output
DSR (+/B), Data Set Ready
RS-422/V.11
22
29
Input
DTR (+/B), Data Terminal Ready
RS-422/V.11
23
30
Output
AuxClk (-/A), DTE Clock Output
RS-422/V.11
24
17
Output