Author Topic: RS485 2 wire to RS485 4 Wire  (Read 12678 times)

pstiles

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RS485 2 wire to RS485 4 Wire
« on: November 06, 2006, 06:57:08 PM »
Can you please tell me how I can connect my 4 wire touch panel with the following connections to the two inputs on your T100MD888 plc?

TXD+
TXD-

RXD+
RXD-

support

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Re:RS485 2 wire to RS485 4 Wire
« Reply #1 on: November 07, 2006, 11:38:13 AM »
Unless your touch panel manual mentions that the HMI can drive the RS485 in two wire mode you can't use 4-wire RS485 with 2-wire type on the PLC. If your HMI has option to drive the RS485 at 2-wire mode then the HMI should also mention how it is supposed to be connected.  Please refer to the HMI manual on this matter.
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