Appendix A Cabling for RS-232 Port
81
25-pin NULL Modem Cable:
Remoet host
seria l po rt
connector
Calling system
seria l po rt
connector Signal
23Transmit Data
3 2 Receive Data
4 5 Request to Send
5 4 Clear to Send
6, 8 20 Data Set Ready
and Carrier Detec
7 7 Signal G r o und
20 6, 8 Data Terminal
Ready