Raven II Digital Cellular Modem
5
Model PS12LA
BP12
BP24
Charging Source/
Notes
1
1,2
1,2,3
Battery
7 Ahr
12 Ahr
24 Ahr
Approximate
Operating days
4
7
15
1.
10 watt solar panel recommended as charging source in
remote applications, model MSX10
2.
12VDC regulator, model CH12R
3.
Larger enclosure required, model ENC 16/18
To preserve battery life in solar powered systems, the battery Amp-hour
capacity used to calculate reserve capacity should be multiplied by 0.5 (i.e., the
net result is to cut the number of days listed above in half.) A ten day reserve
battery capacity is recommended. To get to a ten day reserve capacity, reduce
the amount of time that the modem is powered with the above batteries or get a
larger capacity battery. Note that in the power budget calculated above, the
majority of the power is consumed by keeping the modem powered even
though it is not being used. Powering it only half as long would essentially cut
the power requirements in half (program examples, section 6).
A user-supplied “ RV” or “ marine” deep cycle battery is an economical
battery with a larger capacity (60 – 100 Amp hours). Such a battery can be
charged with the MSX20R solar panel and housed outside the enclosure.
5. Installation
5.1 Datalogger Site Equipment
•
Raven II Modem and power cable.
•
Datalogger—CR510, CR10(X), CR23X, CR7, or CR5000.
•
SC932 or SC932A Interface—converts the modem’s RS-232 port to the
datalogger's CS I/O port. The 10871 9-to-25-pin adapter is required to
connect the Raven II to an SC932 Interface. The adapter is not necessary
for the SC932A. Alternatively when using a CR23X or CR5000, a 14393
Null Modem Cable can be used to connect the modem to the datalogger’s
RS-232 port instead of the CS I/O port.
•
14394 Raven II Mounting Kit w/ Adapter—includes mounting hardware
for securing the modem to an environmental enclosure and the SC12
cable.
•
Antenna—the following antennas can be purchased from Campbell
Scientific; sites near the edge of the CDPD coverage require the Yagi
antenna. Contact an Applications Engineer for help in determining the
best antenna for your application.
NOTES: