Black Box ME801-C, Руководство пользователя

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SHORT-HAUL MODEM-B SYNC (SHM-B SYNC)
4.3 Initial Testing
When you have installed and powered up a pair of
SHM-B Sync units and the attached RS-232 devices, test
your system by sending data from one RS-232 device to
the other (and vice versa if the link is meant to be
bidirectional). If this works, go on to
Section 5.1 . If it
doesn’t, perform loopback testing as described in
Section 6.1 and refer to the problem descriptions in
Section 6.2 as necessary.