Instruction manual

COM100 Cellular Phone Package
14
Campbell Scientific’s PC208 and PC208W software has error checking
algorithms to ensure the integrity of your data even on very noisy links. Given
that the COM100 system typically has power cycled to it, noisy links will take
more time because the suspect data packets are re-sent again to the computer.
If the datalogger sees more than 150 invalid characters, it will terminate the
link. At the PC, one thing a user can try is to reduce the baud rate as low as
300 baud (the field modems are 300 to 4800 baud auto-negotiable). This
reduces the required bandwidth and the data retrieval usually will require less
retries. However, 300 baud data retrieval can take 4 times as long as 1200
baud; hence, this can be a costly solution.
Additional Troubleshooting Notes for COM200/COM210 Phone Modem
1) Verify nothing else is using the same COM port on the computer. Even if
a program is minimized in windows, it may have a lock on the COM port.
Some notebook computers do not automatically activate the COM ports.
Verify the COM port you are using is activated.
2) The Campbell Scientific software will display an activity of
communication as the link is being established. Assuming the above
items are O.K., the software should display in the activity window/screen
something such as “ATDT#######”. Where the #### is the telephone
number listed in the dialing path of the software for the datalogger you
are trying to call.
The local modem attached to the computer will respond back to the
computer with result codes depending on how the call is progressing.
These result codes can be either numeric (0, 1, 2, etc.) or “verbose”
(“OK” , “ CONNECT”, “RING”, etc.). Our software expects numeric
result codes. The result codes may appear on a new line, be appended to
the last line, or may even replace the first letter(s) of the last line. If these
characters are verbose, the initialization string for the modem will need to
be changed. Below is a list of possible result codes. The result code
returned may indicate why the call is unsuccessful.
RESULT CODES:
0 OK
1 Connect
2Ring
3No Carrier
4Error
5 Connect 1200 Baud
6 No Dial Tone
7Busy
8No Answer
12 Connect 9600 Baud
13 Connect 9600/14400 Baud
17 Connect 9600 Baud
3) Verify the COM210 is receiving 12 VDC. If the COM210 is receiving 12
VDC from a separate power supply instead of the datalogger, is the