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Raveon Technologies Corp.
Configuring RS-422 Tri-State
(Simplex Communication).
To put the RS422 into a tri-state mode, do not connect pin 1 (MODE) to anything.
Leave it disconnected or set to 3.3V.
When the MODE pin is open or at 3.3V, the TX driver is in a tri-state mode, so
communications is Half Duplex, meaning the device cannot receive data when it is
sending data. 1-2mS after it sends out data, it can start receiving inbound data.
If you want to use RS-485
Simplex Tri-State
outs, Order the RS422 version of the Tech
Series panel, and use it in your system. RS-422 4-Wire Tri-State operates the same as
RS-485 4-Wire Tri-State.
