CTI Products RCD Standard - Remote Comparator Display - Manual (Page 111)

MCN Remote Comparator Display Appendix B
CTI Products, Inc. Modem Support
68-10856-210
105
The default initialization string (found in the file MODMINIT.HIB) is
INIT=^A^T^Z^\^^ATE0V1&C1&D2&Q5&K3S0=1\^^AT&W0\
Thus, with the default string, the HIB will output the following when it is reset:
•
delay 1/2 second before sending any characters (this gives the modem
time to power up if both the HIB and modem are powered up
simultaneously).
•
the ATZ command is sent to the modem followed by a carriage return
to reset it. A 500 msec delay is put between each character to give the
modem time to perform its automatic baud rate detection and setting.
•
a 1 second delay is added (2 ‘^’ characters) to give the modem time to
reset itself.
•
the initialization string is sent, with no delays, to program the modem
for remote, auto answer operation.
•
a 1 second delay is added (2 ‘^’ characters) to give the modem time to
reset itself.
•
the AT&W0 command is sent to the modem so that the modem will
store the new configuration in it non-volatile memory. By doing this,
the modem will always power up in the correct mode of operation if it
is turned on before the HIB is.
The following is a list of steps required to change the initialization string:
1.
Connect the HIB to the PC, using the COM port specified in your
DEVICE=CTIHIB.SYS command line of CONFIG.SYS. Make sure the
HIB’s OPTION A switch 5 is DOWN and that the HIB’s baud rate switches,
OPTION A switches 1, 2 and 3 match the baud rate that will be specified on
the HIBCNFG command line.
2. Disconnect all cables from the HIB’s NETWORK IN and NETWORK OUT
ports.
3. Run the HIBCNFG.EXE program supplied on your CTI MCN Remote
Comparator Display disk.
4. After executing the command, you will be told if the initialization string was
successfully programmed or not. If the command fails, make sure your HIB is
connected to the PC properly and that the HIB’s option switches are set
properly and then try again.
10.3 Multiple Speed Operation
If you would like to be able to dial into the HIB with modems using different baud
rates such as 28800 or 14400, you will need a modem that supports Automatic
Speed Buffering (ASB) or Constant Speed DTE. ASB is required because the
HIB communicates at only one baud rate (selectable from the HIB’s option
switches). If you use remote PCs to call in at different baud rates, the modem
must buffer data and convert the data from the variable phone line rate to the
HIB’s constant rate.