Omega RD200 - Manual (Page 120)

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19. HARDWARE CHECK 19.7 Communications IF Check
This check is only available for the communications interface (option). It checks the communications function by
displaying the signal received after transmitting it.
1
Connections
Except for RS-485, short the transmission and reception terminals.
RS-232C RS-422A RS-485
Short SD and RD terminals.
Short SDA and RDA terminals.
Short SDB and RDB terminals.
Open circuit.
(No need to short.)
SA RA SG SD RD SG
Shorted
SDA SDB RDA RDB SG
Shorted
Shorted