Omega Vehicle Security OMP-MODL manual TTL Alarm Output Terminal

2... OMP-MODL System Base

Relay R2 (Terminals 5 & 6)

Wiring connections for Output Relay 2. The relay is a normally open device with contacts rated for 500 ma MAX at 32VDC MAX. Operation is dependent on logic associated with the Relay Alarm #2 icon within the Program Net executing in the logger.

+5V (Terminal 7)

This terminal provides a current limited, voltage regulated +5 VDC supply for alarm and sensor excitation applications. The supply is current limited to approximately 100mA and is short-circuit protected. ON/OFF control of the output is dependent on logic associated with the +5 Volt Out icon within the Program Net executing in the logger.

Loads should be connected between Terminal 7 ( + ) and GND at Terminal 9 ( - ).

TTL Alarm Output (Terminal 8)

A low current 5Vdc rated digital output is available from this terminal under control from the Digital Alarm #1 icon within HyperNet. The output swings from 0 to 5VDC relative to the GND terminal (terminal

9)and is intended for sourcing and sinking signal level loads only.

The output is current limited with an internal 4.3Kohm series resistor

Figure 2... -6: System Base Digital Output

(TTL) Current Sourcing Characteristics

which results in varying output voltage levels as a function of load or sourced current as shown in Figure 2... -5. This Digital Output provides sufficient current for control of the Omega Engineering RPS-1, Rechargable Power Supply which can be used for powering/ exciting higher current sensors such as 4-20mA transmitters (see Accessories in Appendix H).

GND (Terminal 9)

This terminal serves as a common or ground connection for the Digital Outputs and for the +5V supply. It is connected directly to the OMP-MODL circuit ground.

2-10 Using the OMP-MODL