https://www.yokogawa.com/in/library/resources/faqs/ns-faq-gxgp-137-spec/
Are the screws for the SMARTDAC+ GX/GP series' optional RS-232 connector (suffix code /C2) metric...
The RS-232 connector screws are imperial. The D-Sub 9-pin connector on the main unit side is male. | Yokogawa India
gp seriessuffix codescrewsoptionalconnector