Omega Vehicle Security OMP-MODL Voltage Current milliAmps, MLIM-2 Digital Output Application

3... INTERFACE MODULES

MLIM-2; DIGITAL OUTPUT APPLICATION

The MLIM-2 provides four channels dedicated as outputs. These channels can be configured for functions such as alarming. The output is a current limited voltage signal with the voltage/current characteristics shown in Figure 3... -24. As shown, with a light load, the output voltage maintains approximately 4+ VDC but as the

Digital	5
Output icon						HL023
(MLIM-2)
	4
	3	Voltage
	2
	1
	0		Current (milliAmps)
	0	3	6	9	12	15
	Figure 3... -24: MLIM-2 Digital output drive characteristics

current draw increases, current limiting occurs and the output voltage droops. The output can be short circuited continuously without damage to the output drive circuitry, but the OMP-MODL battery life will be drastically reduced.

Note that the when the Output is OFF, it is merely floating, ie it is not driven to a ground (or shorted to ground) potential. This may be a consideration when driving TTL or other type inputs. A pull-down resistor (eg 10K) can be added on the terminal strip connections from the output to the common to provide a low resistance OFF state if necessary. Keep in mind if a pull-down resistor is added, that this resistor will consume power when the Output is ON.

3-36 USING THE OMP-MODL