Which file should I choose?
Use UD_21002277.pdf (revision A) to read the original sheet, including its annotations and any marked dimensions. The selected drawing sheet is page 1.

ABB User -Btu 8000/8100 Generic Wiring Guide RS-232 (9-Pin or 25-Pin "D" Connectors): original PDF for terminal or connection hardware layouts.
A communication interface helps devices exchange information. A gateway may translate between communication systems, while a transceiver sends and receives their signals.
Use UD_21002277.pdf (revision A) to read the original sheet, including its annotations and any marked dimensions. The selected drawing sheet is page 1.
1 inspected original for ABB User -Btu 8000/8100 Generic Wiring Guide RS-232 (9-Pin or 25-Pin "D" Connectors): UD_21002277.pdf (PDF).
PDF · 70 KB · Rev A · Reference document
Download filename: UD_21002277.pdf
Original manufacturer drawing sheet
1 inspected original for ABB User -Btu 8000/8100 Generic Wiring Guide RS-232 (9-Pin or 25-Pin "D" Connectors): UD_21002277.pdf (PDF).
ABB supplied the original files through https://search.abb.com/library/Download.aspx?DocumentID=UD%2F21002277&LanguageCode=en&DocumentPartId=&Action=Launch. The source reference, revision, original bytes and checksum are retained with each download.
Original publisher: ABB. Source checked 2026-11-11. Original bytes are preserved; file links and document references identify the source.
Manufacturer source discovery; confirm the exact regional equipment configuration and certification separately.
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