Tek-Trol Tek-LCD 7802A, Instruction Manual, Page: 15 / 43

3.3 Open Collector Output Connections
Output connections are made to two terminals labelled OUTPUT. Connect to an input device such
as alarm indicator or pulse counter as shown in Figure 6, or drive a relay as shown in Figure 7.
To avoid damaging the Tek-
LCD 7802A’s amplifying comp
onents, 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