Honeywell 621-0012R ASCII module and 620-1200 Logic Control processor

Hi all,
Can anybody tell me what the Honeywell 621-0012R and 620-1200 do?

Better still, does anybody have a manual or experiences of these.

It might be the system converts the like of ASCII to Modbus RTU for a TDC3000 use.

Any help would be great!
 
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