Datasheet

-25
Auxiliary and Control Port Cabling
Table C-38 SCM AUX and Control Port Pin Assignments
Null Modem Cable
Figure C-1 shows a null modem cable that connects some of the 1200 and 2400 baud modems to the
IGX Control and Auxiliary ports.
Figure C-1 Null Modem Cable
Interface: The IGX SCM auxiliary and control ports are configured as an
EIA/TIA-232 DCE port.
Suggested Cable: 24 AWG, 25-pair. A straight-through EIA/TIA-232 cable is used for a
terminal or printer connection. A null modem cable (Figure C-1) is needed
when interfacing with modems on either port.
Cable Length: 50 feet (15 m.) maximum.
Cable Connector: DB-25, subminiature, male. Table C-38 contains a list of the port pin
assignments.
Pin No. Name Source Description
1 FG both Frame Ground
2 TxD DTE Transmit Data
3 RxD DCE Receive Data
4 RTS DTE Request to Send
5 CTS DCE Clear to Send
6 DSR DCE Data Set Ready
7 SG both Signal Ground
8 CD DCE Carrier Detect
20 DTR DTE Data Term Ready
H8377
1
7
8
2
3
4
5
6
20
1
7
8
2
3
4
5
6
20