Campbell Com100 Instruction Manual - page 19
COM100 Cellular Phone Package
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on. (This is for testing purposes only.) Do not turn if off. See warning in
front of manual.
Q.
Can you call in or out of the site with a standard touch-tone telephone?
A simple analog touch-tone telephone can be used to test the cellular phone
system. Disconnect the field modem from the 4-pin RJ11C Interface box.
Connect your analog phone to this same 4-pin port. Set the control port high
connected to the green control wire. You should hear a “ beep” on power up
and the LED should flash for about 10 seconds. After 10 seconds you will
hear a dial tone and the Red LED should be glowing constantly. Dial a
number to a location where you can verify the call out link. As a second test,
have someone call into the site while the analog phone is connected. The
phone should ring when a call is received.
Q.
Is the directional antenna pointed at the cellular provider tower?
Directional antennas such as the ASPD962 (CSI Model 10530) focus the Radio
Frequency (RF) energy in one direction, and have a greatly reduced radiation
pattern in the opposite direction, this is how gain is achieved. If you are in a
location where cellular coverage is marginal, selective pointing of the antenna
directly at the cell tower will be required.
Q.
Does your datalogger program contain the necessary control instructions
to turn the cellular phone on and off?
The COM100 requires a logic control port to turn the cellular phone on. The
green wire of the power control cable should be wired to a control port. Check
to ensure that the screw terminals are not crimped on the green insulation of
this cable. Instruction P92 is typically used to turn the phone on based on real
time. The 3
rd
parameter of P92 is used typically to turn the phone on and off.
Refer to previous program examples for reference.
2.
When I dial the cellular number, my calling modem and the Datalogger
modem connect but nothing further happens.
Q.
Are you using a high speed Modem (i.e. 14.4, 28.8, 33.6)?
Campbell Scientific’s PC208 and PC208W Datalogger Support Software do
not support local flow control. Typically modem initialization strings must
sent to the phone modem prior to dialing the phone number. Please refer to the
PC208 and PC208W Datalogger Support Software manuals for information on
how to setup the initialization strings.
3.
When I establish a connection to the datalogger I sometimes see odd
characters scrolling across the screen.
Cellular Phones that are on a marginal link can introduce noise that the
computer sees as data. On a very noisy link you will see “ garbage” characters
like:
!@#)*$)*)*!)@$)!#3123313213*Fd