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Appendix B: Hardware Diagnostics
The 14.4Kbps modem includes several tests which
evaluate the operation of the modem, its connection to the
local DTE, and the communications link between the local
and remote modems. Use of these tests requires setup of
internal registers and may also require the use of two
modems and a central office line simulator. A thorough
knowledge of modem operation and registers is needed
for their use and should not be undertaken lightly.
Local Analog Loopback Test
This test verifies the path between the local modem and
the PC.
1. Set the DTE speed from 1200 to 14,400 bits per second.
If the speed is less than 1200 or greater than 14,400 the
test WILL NOT operate and a result code of ERROR
will be generated if any tests are attempted.
2. Make sure the modem is in command mode (no
connection made).
3. Issue an AT&Q0 command to the modem. This sets the
modem to the direct mode.
4. Set the timer register (S18) for desired test time (in
seconds). Example: “ATS18=10” provides for a 10
second test.
Hardware Diagnostics