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.
11.3.2 Connecting to a DCE Device
Because the WAN interface 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 WAN emulates a DTE.
11.3.2.1 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 interface.
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.
100
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
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