Campbell Scientific COM220 56k Phone Modem - Manual (Page 22)

Appendix A. Changing COM220 Settings
TABLE A-1. Selecting ME
Baud Rates via DIP Switches 3 and 4
ME Baud Rate Switch 3 Switch 4
9600
Open Open
38400 Open Closed
57600 Closed Open
115200 Closed Closed
Please note that older dataloggers (such as the CR10X, CR23X, and CR510)
cannot support the highest COM220 ME baud rates. TABLE A-2 lists
maximum datalogger baud rates.
TABLE A-2. Maximum Datalogger ME Baud Rates
Datalogger Max Baud Rate
CR10X, CR510, CR7, CR21X 9600
CR23X 38400
CR5000 57600
CR800, CR1000, CR3000 115200
DIP Switches 5, 6, and 7: Not used
DIP Switch 8: Configuration Mode
Closing DIP switch 8 (and cycling power to the COM220) places the COM220
in configuration mode. The COM220 can be configured using an SC532 or
SC532A with a 12-Vac adapter (pn 15966) and Device Configuration Utility
version 1.6 or newer and Hayes AT commands (see below).
A.2 Hayes AT Commands
To configure the COM220 with Hayes AT commands, you will need the
Campbell Scientific Device Configuration Utility version 1.6 or newer and an
SC532 or SC532A device. An SC12 cable must be connected to the peripheral
port on the SC532 or SC532A and the CS I/O port on the COM220. Another
cable should connect the RS232 port (if using an SC532 device) or the PC port
(if using an SC532A device) to one of your computer’s serial ports. If using an
SC532A device, power will be provided to the modem by the SC532A with a
12-Vac adapter (FIGURE A-1). However, if using the older SC532, you must
apply 12 V to the COM220 via the green connector.
A-2