Honeywell – 203-251 RS485 Network Adaptor

Name: Honeywell – 203-251 RS485 Network Adaptor
Brand: Honeywell
SKU: 203-251

MPN: 203-251 · Brand: Honeywell

Price on request

Discontinued by Honeywell — we can still source the original 203-251 (new, used or refurbished, subject to availability). Request a quote below.

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12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	Honeywell Building Management Systems (BMS)
Lifecycle	Discontinued
Warranty	12-month (new) · 3-month (used/refurbished)

Shipping & availability

Can I still buy the 203-251 now that it is discontinued?

Yes. Honeywell has discontinued the 203-251, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time.

When can 203-251 be shipped?

203-251 is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up 203-251 in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for 203-251 and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for 203-251, subject to availability and destination.

RS485 Network adapter can be used to convert 4G to 2G network applications with or without door switch input using the adapter (P/N 203-251) which connect the harness from the wall box (P/N 62-1462) previously connected to the thermostat being replaced) to H1 of the adapter. Connect the harness H3 (rainbow) of 203-251 to H7 of the e528.4G then connect the harness H2 (Black) of 203-251 to H5 of the e528.4G. Take care to not reverse the connections to the e528.4G

Honeywell 203-251 — RS485 Network adapter can be used to convert 4G to 2G network applications with or without door switch input using the adapter. Discontinued by Honeywell — no longer in the current range. PartnerPLC sources new, surplus and discontinued Honeywell parts — request a quote for price, condition and lead time.