honeywell controller


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Does anyone know what communication protocols a Honeywell 620-36 processor supports. This is the processor in a rack based system with remote racks. I would like to interface it to a A-B plc

Richard Willis

The Honeywell 620-36 has a 25-pin communication port on the Processor Module (labeled COMM) that communicates RS422/485. There are 3 protocols supported are: Honeywell Asynchronous Byte Count (Honeywell protocol), PeerData Network (620 PLC peer to peer communications) and Modbus RTU. You will have to enable the port for the Modbus RTU protocol using the 623-60 loader software. You can look at the details in the 620 Processor manual (620-8964). Email me directly if you have any other questions at [email protected]