CS-GSM/GPRS Digital Transceiver Kits (including the COM110 modem)
6.2.1 Connection to a CS I/O Port
The Campbell Scientific SC-WMI interface provides a simple, very low power
interface for connecting the COM110 modem to the CS I/O port on Campbell
Scientific dataloggers. The quiescent current consumption of the SC-WMI is
typically less than 100 µamps and it uses less than 3 mA when communications
are in progress. There is no user configuration of this device. It is simply
connected between the datalogger CS I/O port and the COM110 modem as shown
below in Figure 1.
The SC-WMI is not recommended for use where other devices are
sharing the CS I/O port. The maximum baud rate it can support is
38400 baud.
The SC105 is connected to the datalogger using an SC12 cable and then to the
COM110 using a 0.5 m grey cable. Please take not of the marking on the case of
the SC105 indicating which end connects to the datalogger to ensure it is installed
the correct way around.
The SC105 may need to be configured before use to make sure it is in modem
mode and the baud rate of its serial port matches the speed set for the COM110.
Please refer to the SC105 manual for further details.
6.2.2 Connection to an RS232 Port
If using a CR23X, CR800, CR1000, CR3000 or CR5000 datalogger, an alternative
connection is possible using the RS232 port, if this is free. The CR200 only has an
RS232 port so this is the only option.
The cable required for the direct connection to a datalogger serial port is supplied
as part of the CS-GSM/GPRS 232 kit. The 9-pin connector plugs in the
datalogger RS232 port and the 15-way connector directly into the COM110
modem.
NOTE
SC-WMI
SC12 cable
Figure 1 Connecting the COM110 modem to a
Datalogger
Connect to 9-pin
‘CSI’ socket on
datalogger
9-pin
COM110 modem
Diagram Not to Scale
Connect to 15-pin
socket on the COM110
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