D/I Mux III User’s Manual Appendix G. Modem Interfaces
260
Terminating Connection
At the conclusion of transmission, the connection must be terminated. Follow the steps listed
below for terminating connection with each device listed.
Port Expander
If a port expander, or other black box device, has been configured into the network follow
the steps listed below, otherwise proceed to the next section.
1. Send the unlink command to the port expander, using the following recommended
command string: 0t.r.o.PU0x
2. Wait for an UNLINK DONE response (which should appear within 3 seconds).
3. If the UNLINK DONE response is received, proceed to the next section.
4. If there is no response, proceed to the next section.
5. If there is a LINK UNAVAILABLE response, clear all possible connections using the
following recommended command strings:
0t.r.o.PU01
0t.r.o.PU02
...
0t.r.o.PU08
6. Wait for a response for each unlink command.
7. If a response of UNLINK DONE is received, proceed to the next section.
8. If a response of LINK UNAVAILABLE is received, continue clearing all possible
connections as indicated above.
9. When all possible connections have been cleared, proceed to the next section.
Modem
If a modem has been configured into the network, follow the steps listed below, otherwise
proceed to the next section.
1. To ensure that the modem is not in an off-hook state; hang up the modem using the
following recommended hang-up command string: ~~~+++~~~ATH0!
2. Wait 2-3 seconds.
3. Send the escape sequence using the following command string: +++
4. Wait for an OK response (which should appear within 3 seconds), and continue.
5. Send the following hang-up command: ATH!
6. Wait for an OK response (which should appear within 3 seconds), and continue.
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