Case Communications Mayze 24, Reference Manual, Page: 26 / 166

DTE for Synchronous Data and Asynchronous Commands
To configure the modem, AT commands must be entered asynchronously.
If the DTE can operate in both synchronous and asynchronous modes, it
can be used for both transmitting data and controlling the modem,
provided you switch it between modes when you swap between data and
commands. See Figure 2-1B.
Connection is similar to the paragraph above.
DTE for Synchronous Data, and Command Terminal for
Asynchronous Commands
If you do not want to keep switching between modes, or if the DTE is a
synchronous-only device, the separate command port must be used for
entering commands. See Figure 2-1C and Section 2.3.3.
The synchronous data DTE must be connected via a cable to the modem's
DTE interface connector. A straight-through 25-way cable as described for
asynchronous data will be suitable for many synchronous terminals, but
there are some which require a cross-over cable. If in doubt, consult the
DTE's manual for connection details and compare with information in
Appendix B of this manual.
This configuration can, of course, also be used for an asynchronous DTE
plus a command terminal.
2.3.3 Command Port Connection
The command port allows you to connect a separate asynchronous
command terminal for entering commands, as shown in Figure 2-1C.
The port is provided on a stereo jack socket. An adapter cable to convert
this to a standard 25-way D-type socket (ISO 2110) is provided (see
Appendix B for details).
The data format and speed for the command port is fixed at 7 data bits,
even parity, 2400 bps.
X460-306851 Issue 1 2-6 Rev.0