Honeywell EK205-M Operating Instructions Manual page 77

Data transfer
8.2.2.1.2 Two-wire simplex wiring (RS485 mode) with repeater
As specified in section
EK205-M. However, these are present in some RS485 connections and in some
circumstances cannot be removed. Furthermore, there are often multiple subscribers
connected to the bus which means that electrical isolation is recommended.
For these cases, Honeywell recommends the ADAM-4510S repeater from Advantech
both for the electrical isolation and for connection to a bus with terminal resistors:
8.2.2.1, no bus terminal resistors may be connected to the
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