How to connect pressure transmitter & RS485 Modbus software

Wiring connection
POWER SUPPLY (+) to TRANSMITTER (+)
POWER SUPPLY (-) to TRANSMITTER (-)
RS485 MODEM (A) to TRANSMITTER (A)
RS485 MODEM (B) to TRANSMITTER (B)
For more info please visit www.leegsensor.com or contact [e-mail]
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[@mandornot9789]

Por que no unifica las tierras?

[@juanaboytes7587]

en el 485 no es necesario