Keri Systems SB-293 - Manual (Page 61)

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293
Revision 5.5 P/N: 01836-004 Page 61
9.10.2 Modem to Controller Serial Connection
If you are making the connection between access control network and host computer
via a set of modems, you will use two different cables: one between a modem and the
host computer (see “Modem to Personal Computer Serial Connection” on page 65)
and one between a modem and the master controller.
• If the modem has a female DB-25 connector, you must use a Keri Systems KDP-
336 cable or create a cable according to Table 17 and Figure 9-16, both on page 62.
• If the modem has a female DB-9 connector, you must create a cable according to
Table 18 and Figure 9-17, both on page 63.
• If the modem was purchased from Keri Systems, it comes with an adapter that
accommodates a female DB-9 connector, should the modem have a DB-9 (instead
of a DB-25) connector. Use this adapter cable in conjunction with a KDP-336 to
make the modem/controller connection (see Figure 9-18 on page 64).
For Keri Systems' cables, each connector housing will be marked with either "PXL-
250" or "MODEM." If you create your own cable, use a permanent marker and mark
each connector housing with the appropriate label (PXL-250 or MODEM). Each
connector is biased so it will fit on its corresponding socket in one direction; you
cannot plug in a connector incorrectly.
Take the completed cable and insert the connector marked MODEM into the serial
port connector in the back of the modem. Insert the connector marked PXL-250 into
the J1 serial port connector at the top of the PXL-250 controller. Each housing on the
serial cable's connectors has two small screws in the housing's case. These screws
correspond with threaded stand-offs on the serial port connector bodies. With a thin-
blade screwdriver, secure these screws to the stand-offs to ensure the cable does not
loosen itself from its serial port connections.