Campbell Scientific CR23X Micrologger - Manual (Page 283)

G-1
APPENDIX G. CALLBACK (CR23X INITIATED
TELECOMMUNICATIONS)
Callback is a joint feature of the CR23X and PC208W Datalogger Support Software. In common
datalogging applications, the PC calls the CR23X; with Callback, the CR23X is enabled to call the PC.
Callback is usually used to immediately notify operators via PC that an alarm condition exists. This
appendix also covers using the CR23Xs portion of Callback (Instruction P97) to initiate calls using a
voice synthesizer modem or calls to a pager service.
G.1 INTRODUCTION
Successful use of Callback requires precision
placement of hardware and software elements.
Success is usually achieved by first becoming
proficient with the simplest case, then
incrementally adding levels of complexity. If
possible, become familiar with Callback over a
simple RS232 connection (using the SC32A
Interface or SC929 Cable) before incorporating
telephone or radio options.
G.2 DEVELOPING A CALLBACK
APPLICATION
Suggested procedure:
1) Establish telecommunications with the
CR23X with the PC208W Datalogger
Support Software. For help in doing this,
consult the PC208W manual, PC208W on-
screen help, and the CR23X manual.
Limited free telephone support is also
available from Campbell Scientific
applications engineers.
2) Modify the PC208W software to answer a
call. Three simple modifications are
required:
a) As shown in Figure G.2-1 go to
PC208W | Setup | COM(Port#) |
Hardware and check the box labeled
“Allow Call-back On this Port.” Also, set
the Callback baud rate equal to that
used in step 1 above. If in doubt, use a
baud rate of 1200. Setting the port to
allow callback may cause PC208W
storage module support to malfunction.
FIGURE G.2-1. Configuring COM Port for Callback