
Microtronix Access User Guide
DB25M
DB25F
DB25M
DB9F
1
1
1
-
2
2
2
3
3
3
3
2
4
4
4
7
5
5
5
8
6
6
6
6
7
7
7
5
8
8
8
1
20
20
20
4
The following cables are used to connect to DTE devices. Usually a DTE device has a male connector,
but some have a female connector requiring a straight through gender changer. Connecting to a DB9M
PC COM port requires a 9-pin adapter.
10.3.2 Connecting to a DCE Device
Because the port is configured as a DCE, a standard null modem (crossover) cable must be used to
connect to another DCE device (for example, a modem), so that the port emulates a DTE.
10.3.2.1 Null Modem Cables
The table shows the pin configuration and connectors. The cable is symmetrical, so it doesn't matter
which end connects to the WAN port.
DB25M
DB25M
1
1
2
3
3
2
4
5
5
4
6 [+8]
20
7
7
20
6 [+8]
Note that pins 6 and 8 (DSR and CD) may be wired together at each end. Alternatively, either 6 or 8
may be used for cross-connecting to pin 20 (DTR) at the other end.
75
Part Number
Description
811-SC6MF
DB25M-DB25F, RS232 straight through cable
811-SC6MM
DB25M-DB25M, RS232 straight through gender changer
[284-MC1MF
DB25M-DB9F, RS232 adapter cable