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Modem Command Reference Modem Command Reference
Modem Command Reference Modem Command Reference Modem Command Reference
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e Diagnostics
e Diagnostics e Diagnostics e Diagnostics
The modem includes two tests which evaluate the operation of the
modem and its connection to the local DTE. 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
A A A A thorough knowledge of modem thorough knowledge of modem thorough knowledge of modem thorough knowledge of modem thorough knowledge of modem
operation and registers is needed for their use and should not be operation and registers is needed for their use and should not be
operation and registers is needed for their use and should not be operation and registers is needed for their use and should not be operation and registers is needed for their use and should not be
undertaken lightly
undertaken lightly
undertaken lightly undertaken lightly
undertaken lightly.....
NOTE: Make sure you have disabled error correction (A NOTE: Make sure you have disabled error correction (A NOTE: Make sure you have disabled error correction (A NOTE: Make sure you have disabled error correction (A NOTE: Make sure you have disabled error correction (AT\N0) and T\N0) and T\N0) and T\N0) and T\N0) and
data compression (A data compression (A
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Local Local
Local Local
Local Analog Loopbac Analog Loopbac
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This test verifies the path between the local modem and the PC.
1. Set the DTE speed.
2. Make sure the modem is in terminal 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.
5. To begin the test, type AT&T1 [ENTER]. The modem should respond
with a CONNECT message.
6. After the number of seconds specified in S18, the modem will
terminate the test and respond with “OK”.
9346.p65 11/20/97, 9:34 AM 55