RS232 DB9 female interface. RS232 DB9 female interface. Product series: RS232. 1 x RS232 Relay. This is 4 Channel Relay Module. This is 4 Channel Relay Module. Standby current (all relays closed) 18MA, 1 channel relay open 50MA, 2 channel relays open 81MA, 3 channel relays open 110MA, 4 channel relays open 141MA.
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