Connection To Modems - HP A4500A - VMEbus Single Board Computer 744 Motherboard Manual

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