58
RS-232 connection
7
RS-232 Connection to modems
This cabling scheme is recommended for connecting modems to a DTC.
Note The DTC does not monitor the RI signal from the modem.
Existing HP cable: HP 40233A
25-pin male connector to DTC
1 - PGND -
2 - RD INPUT
3 - TD OUTPUT
4 - DCD INPUT
5 - GPO OUTPUT
6 - DTR OUTPUT
7 - SGND -
8 - RTS OUTPUT
9 - RI INPUT
20 - DSR INPUT
22 - CTS INPUT
25-pin male connector to modem
1 - PGND -
3 - RD OUTPUT
2 - TD INPUT
8 - DCD OUTPUT
20 - DTR INPUT
7 - SGND -
4 - RTS INPUT
22 - RI OUTPUT
6 - DSR OUTPUT
5 - CTS OUTPUT
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