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http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 11 2014-05-18/Lars

WaiEnd

Counter for ModBus RTU and UISServer telegrams who have had the end condition

determined by absence of incoming characters for enddl (see below) 5 ms ticks.

enddl

Min wait in in 5 ms ticks for absence of incoming characters to determine end

condition.

Note 1. Rxlfm indicates what kind of format error occurred last, as rxfme increments. In some

cases, a NAK response is sent back to the master/client. This is indicated in the

following table with a numerical value. An “x” indicates that the telegram will be ignored

for the format error. An empty field indicates that the specific format error does not

apply for this protocol.

Rxlfm

ASCII

RTU

Format error

Illegal receiver buffer length

Illegal characters in telegram – Modbus ASCII only

Not used in Modbus

Function 3 telegram not 8 bytes

Not used in Modbus

Unknown/Unsupported Function

Byte count disagrees with buffer length Function 16

Byte count disagrees with length field Function 16

Not used in Modbus

Illegal end sequence: LF not following CR – Modbus ASCII only

ISR Receiver buffer overrun

ISR Transmitter buffer overrun

ISR Characters received after end of message, before reply sent

ISR Illegal (default) receiver state (COMrxsta)

Outside CIT legal read space on CIT read or write

Unsupported subfunction for function 8 telegram

Function 8 telegram not 8 bytes

Write to read-only space in CIT

19-33

Not used in Modbus

Transmitter length rollover – Should never happen

Receiving characters while transmitting

Use the integrity bit.

In the PLC, toggle the integrity bits (Word 44, bit 7) every 2 seconds. Monitor the integrity echo bit

(Word 16 bit 7). If they stop toggling, communications has failed, and appropriate steps can be

taken. The integrity bit can be monitored in the TCMI CIT Diagnostic Screen (P1), and the GCM

can be set up to monitor the activity of the integrity bit, potentially generating a Warning or Fault if

the bit stops toggling.

PLC Program examples.

There are plenty of PLC example programs available in the Merrick MCT web site. See

http://www2.merrick-inc.com/mct/.

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