Internet PLC Forum
General => Technical support => Topic started by: pstiles on November 06, 2006, 06:57:08 PM
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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-
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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.