Omega Vehicle Security manual OMP-MODL System Base

2... OMP-MODL System Base

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.

Using the OMP-MODL 2-7