Tek-Trol TEK-LCD 7800A-0L1, Instruction Manual, Page: 13 / 36

2.9 Open Collector Output Connections
Output connections are made to two terminals labeled OUTPUT. Connect to an input device such as
alarm indicator as shown in Figure 6, or drive a relay as shown in Figure 7.
WARNING
To avoid damaging the Tek- LCD’s amplifying components, use care not to wire incorrectly or
exceed output ratings. A diode, such as 1N4000 series, will provide protection from relay
transients.
Figure 6. Connection to Device with Internal Pull-Up
Figure 7. Output Connections
5-30 VDC
150 mA MAX
SAFE-TOUCH
BUTTONS
UNLOCK LOCK
9-36 VDC LOOP
BACKLIGHT
POWER
SIGNAL BACKLIGHT
OUTPUT
RESET
+ +
+ + -
-
- -