CIRCUTOR QNA-P Series - Manual (Page 30)

Page no. 29
A. Appendix: Communications with QNA-412 connected to an External
modem.
One of the most usual configurations for the QNA-412 is for it to be connected
with an external modem.
Modem A Modem B
To connect it and before its definitive start up, it must be remembered that
both Modems have to establish the correct form of communication. To do so, a
minimal setting for the modem making the call and the modem connected to the QNA
has to be made.
To do this setting, the Hyperterminal program on Windows or equivalent must
be used. The configuration for the modem is:
• MODEM A (PC):
AT&F Default configuration.
AT&D2 Activates the operations of the DTR Data Terminal Ready.
AT&S0 Leave the DSR active Data Set Ready.
AT&W0 Store the configuration.
• MODEM B (QNA-412):
AT& F Default configuration.
AT&D0 Override the DTR.
AT&K3
Deactivate data compression.
AT&R1 The modem ignores the RTS.
AT&N6 Increase the speed of the modem to 9600 bps.
ATS0=1 Activate the modem so that responds to the first ring.
AT& W0 Store the configuration.
The AT commands here may be varied according to the type of modem.
To correctly configure, consult the manuals for the installed equipment.