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 (e.g. CR10X, CR23X, 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 Switch 5: PakBus Ready

Switch 5 should be open (default) for PakBus dataloggers (e.g., CR800, CR1000, CR3000, CR10XPB, CR23XPB, CR510PB), but must be closed for non-Pakbus dataloggers (e.g., CR10X, CR23X, CR510, CR5000). This switch determines if the clock/handshake line is used to detect the ME-PAUSE state.

DIP Switches 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 an SC532A with a 12V AC adapter (part number 15966) and Device Configuration utility ver 1.6 or newer and Hayes AT Commands (see below).

A.2 Hayes AT Commands

In order to configure the COM220 with Hayes AT commands, you will need the Campbell Scientific Device Configuration utility ver 1.6 or newer and a 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 12V AC adapter (Figure A-1). However, if using the older SC532, you must apply 12 V to the COM220 via the green connector.

A-2