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. |
CAUTION 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 set up 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 SC532A or an SC532 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 on 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(A) or SC532 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 (NOTE: 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.