Omega Vehicle Security OMP-MODL - Manual (Page 16)

2... OMP-MODL System Base
Using the OMP-MODL 2-7
CAUTION
The RS-232 jack is only for connection of RS-232
type signals (via the supplied cable and adapters)
and is not for direct connection of a telephone line.
For telephone modem communication with the OMP-
MODL, utilize the OMP-MODL Modem Interface
Module.
Direct connection of a telephone line to the RS-232
jack may result in permanent damage to the OMP-
MODL.
For longer communication distances, a longer cable can be used. Longer
cables can be purchased from Omega Engineering or from stores handling
standard phone supplies. If a cable is procured from a source other than
Omega Engineering, insure that the cable is 6 conductor and has the plugs
installed correctly. Refer to Appendix I for wiring details.
Although the RS-232 specification is only for communication distances up to
50’, communication with the OMP-MODL via RS-232 at Baud rates up to
19.2 Kbaud has been successfully achieved with 100’ of cable.
The OMP-MODL RS-232 communication circuitry powers up when a cable is
plugged into the port and a connection is established from within the
HyperWare Software. When the communication circuitry is powered up, an
additional load of approximately 30 mA is put on the logger power supply.
For this reason, when not communicating with the OMP-MODL and
operating from battery power, disconnect the connection from within
HyperWare and/or unplug the RS-232 cable. For extended communication
sessions battery life can be preserved by powering the OMP-MODL from an
external power supply.
TIP: For relative reference, with the communication
circuitry powered up, a new set of batteries will discharge
in approximately 3 days.