Digi TransPort User Manual page 657

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Note that Frame Ground is optional.

When operating an X.21 (RS-422) link synchronously, it is necessary to fit termination

resistors to each signal pair at the receiving end. The Digi unit has in-built terminating

resistors, but terminating resistors should be fitted between the TxDA and TxDB pins,

CLKA and CLKB pins and CTLA and CTLB pins at the DTE.

Digi TransPort User Guide

DB 25 - Digi Side

DR4410, DR4410i & DR4410p

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