6-7
Signal direction
25-pin type
Your fax Your computer
2 TXD
2 TXD
3 RXD
3 RXD
4 RTS
4 RTS
5 CTS
5 CTS
6 DSR
6 DSR
7 SG
7 SG
20 DTR
20 DTR
9-pin type
Your fax Your computer
2 TXD
2 RXD
3 RXD
3 TXD
4 RTS
4 DTR
5 CTS
5 SG
6 DSR
6 DSR
7 SG
7 RTS
20 DTR
8 CTS
RS-232C Test
This mode is for a return back test of the RS-232C port.
Refer to “RS-232C test,” page 3-69 for the procedure.