Despatch 926E Equipment Manual (C-155)Rev 2/11 - Manual (Page 51)

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Serial Signal Descriptions
The interface converter is equipped with a standard DB-25S connector on its rear panel
and requires a standard DB-25P mating connector. The interface converter's connector
is configured as DCE type equipment for RS-232 communications, which means the
interface converter always transmits data on Pin 3 and receives data on Pin 2. The
following lists and describes the RS-232 and RS-422 signals provided on the interface
converter. The RS-422 pin outs are made similar to RS-530 DCE.