Internet PLC Forum
General => Technical support => Topic started by: Mike_PAC on November 17, 2004, 09:06:46 AM
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I am using your T100MD888 to communicate to a operator display. I need to send ASCII characters to this display. The display operates as a display only, not to communicate back to the Tri-PLC.
I am using the RS485 port with the Tri-PLC RS232-RS485 converter.
The operator display has a fixed baud rate of 1200, with no handshaking required. The operator display is set for RS232 levels, and uses "2" start bits, 1 Stop bit, 8 Data bits and no parity.
I wired the RS232/RS485 Tri-Plc converter using pins 3 and 5.
I have a custom function triggered from the 1st scan bit to set the buad rate on port #3
ie; Setbaud 3, &H0F
I have another custom function that is triggered with a pushbutton input to send out a single character to the operator display.
ie; Print #3 "A"
I get the Red LED on the RS232/RS485 to flash each time when the function is called but no data on the display.
What am I doing wrong?
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The Auto485 pin 2 is the transmit pin to the external device. So you should try pin 2 and pin 5.
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Thanks! That fixed it! .. I must have had Brain Fade!!!!!!