Campbell Scientific RF300-Series DRL VHF/UHF Radio Transceivers - Manual (Page 40)

APPENDIX B. ALTERNATE BASE STATION CONFIGURATIONS
B-2
RF95A
RF300
FIGURE B-1. Portable Base Station
B.3 PHONE-TO-RF BASE STATION
WITH MEASUREMENT CAPABILITY
When it is desired to have a datalogger at a phone-
to-RF base station, the datalogger must be a CR10,
CR10X, CR23X, CR510, or CR500 and the RF95A
must be in the RF95A-SDC State. This
configuration is used when the computer uses a
phone modem to call the RF base station which is
also being used as a field station (because
measurements are being made at the station). The
configuration is shown in Figure B-3.
The Device Map in the Setup Window of
PC208W must include the following interface
devices: COM Port, Phone Modem, RF Modem,
and Datalogger. The Phone number and RF Path
must be set. The COM200 Phone Modem and
the RF95A are connected to and powered by the
Datalogger. The RF95A Station ID at the phone-
to-RF base station does not have to be 255 in this
case. This is because the Datalogger will
automatically hold the Modem Enable line high,
not being reliant on the RF95A.
The datalogger at the base station should have
security set. See the Datalogger manual for the
details of security. With security set, a pass-
word (number) is required before data can be
collected. Without security set, data can
inadvertently be collected from the base
Datalogger if an RF link fails during
communication with another datalogger.