Black Box ME800A User Manual download pdf (Page 16)

SHM-B ASYNC

Because DTR, DSR, RTS, and CTS are tied together

internally, dropping any one of these four signals to a

negative state will also drop DCD on the remote side to a

negative state. DCD will also go LOW if the remote

SHM-B is powered down, or if the twisted-pair wire is

broken.

X-ON/X-OFF M

ODE

(RTS/DTR C

ONTROL

UMPER IN

DIS P

OSITION

)

If X-ON/X-OFF characters are used for handshaking

control, rather than hardware logic levels, move the

RTS/DTR control jumper to the DIS position.

Typically, units that use software X-ON/X-OFF flow

control do not want RTS to affect DCD on the remote

SHM-B. Moving the jumper to the DIS position disables

the RTS/DCD relationship. The only thing that will

force DCD low with the jumper in the DIS position is the

absence of power on the remote SHM-B or a broken

twisted-pair wire.

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Black Box ME800A User Manual Page 16