Case Communications Mayze 24, Reference Manual, Page: 22 / 166

2.2 DTE Requirements
Your data DTE will probably be one of the following:
– A 'dumb' terminal (VDU) connected directly to the modem.
– A PC containing a software package which facilitates communication
with the modem, or which puts the PC in ''terminal emulation'' mode.
– A terminal connected to a computer which is able to communicate with
the modem.
It will transmit and receive data in one of the following ways:
– Asynchronous mode only.
– Synchronous mode only.
– Asynchronous or synchronous mode (switchable).
Consult the DTE's manual for the relevant information.
2.2.1 Controlling the Modem
To control your modem, you will need to send AT commands to it. (V.25bis
commands are a special case, discussed in Chapter 10.)
If your DTE works in asynchronous mode, you can connect it to the
modem's DTE port and enter commands via its keyboard.
A separate command terminal may be used to control the modem when:
– The main DTE operates in synchronous mode only.
– The main DTE does not include an AT-compatible communications
package.
– It is necessary to avoid switching the main DTE between synchronous
and asynchronous modes.
2.2.2 DTE for Commands via the DTE Port
The DTE may communicate in either of the following character formats:
1 start bit, 7 data bits, odd or even parity, 1 stop bit, or
1 start bit, 8 data bits, no parity bit, 1 stop bit.
and at any one of the following baud rates:
19200, 9600, 4800, 2400, 1200, 600 or 300 bps.
X460-306851 Issue 1 2-2 Rev.0