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Honeywell UDC 3000 Modbus

 

This protocol uses the standard ModBus driver, however there is a problem related to writing to this instrument-the instrument issues busy replies to read requests for a short time after a write has occurred.  This means that the ModBus driver command ECR=5 is required for all Honeywell instruments using the SpecView ModBus driver.

Details of the ModBus addressing and driver commands can be found here.