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RS-485 TWO-WIRE MODE
When the MES1B is configured to operate in RS-485 two-wire mode (RS-422/485
switch in the right position) the two-wire RS-485 two-wire communications cable
pair is connected to Terminals TDB and TDA. The communications cable
ground/shield is connected to GND.
RS-485 Two-Wire Connection
No jumpers are required to bridge the transmit
and receive lines in two-wire mode.