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SNC 5100
96 Connecting the Service Terminal
6-00020-02
Table 11 lists the null modem cable connections.
Connecting the Service Terminal
Hardware Required
• RS-232 DB9F null model cable
• RS-232 DTE Terminal or desktop/laptop computer running terminal
emulation software
• RS-232 DB9M-to-DB25F adapter if the terminal uses a DB25M
connector
Table 11: Null Modem Cable Connections
Service
Port Pin
Number
Signal Name
9-pin AT
connector
25-pin (DB25)
connector (DTE)
1 Carrier detect (not used) n/c n/c
2 Receive data <->
Transmit data
32
3 Transmit data <->
Receive data
23
4 Data terminal ready <->
Data set ready
66
5 Signal ground 5 7
6 Data set ready <->
Data terminal ready
420
7 Request to send <->
Clear to send
85
8 Clear to send <->
Request to send
74
9 Ring indicator (not used) n/c n/c