Campbell Scientific COM220 56k Phone Modem - Manual (Page 26)

Appendix A. Changing COM220 Settings
M0 Speaker always off
M1 (default) Speaker on during call establishment
M2 Speak on during entire call session
S0=0 Disable Auto Answer
S0=1 (default) Answer on second ring
S0=2 Answer on third ring
S0=n Answer on (n + 1) ring.
When doing datalogger-to-datalogger communications with
the COM220, if more than six rings are specified, the
datalogger may time out before the modem answers;
communication will never be established! Be sure to try the
setup locally before installing at a remote location.
A.3 Downloading a New Operating System to the
COM220
To download a new operating system to the COM220, follow these steps:
1) You must use an SC532 or an SC532A interface to communicate with the
modem. Connect the PC port (called RS232 on the SC532) to a serial port
on your computer via an RS232 cable. Leave the modem disconnected for
now.
2) Make sure that you have the appropriate serial port selected in the left
panel of the Device Configuration Utility window.
3) Click the Start button.
4) In the resulting file-open dialogue box that appears, select the file that
should be sent as the modem’s operating system. Do not attempt to load
any operating system other than that designed for the COM220
modem.
5) Once you have pressed OK in the file-open dialogue box, connect the
peripheral port on the SC532 or SC532A to the CS I/O port on the modem
with an SC12 cable. If using an SC532, you will also have to apply 12 V
to the COM220 via a green connector attached to a power supply. If using
an SC532A device, power will be provided to the modem by the 12-V
adapter connected to the SC532A.
You must highlight/select the operating system file to be sent
BEFORE applying power to the COM220.
6) The program should now send the operating system to the modem.
Interrupting this process may corrupt the modem operating system.
CAUTION
NOTE
A-6