Campbell Scientific RF310, RF312, RF313 Narrowband Radios - Manual (Page 23)

3-1
Section 3. Radiotelemetry Network
Components
3.1 RF310M Modem
The RF310M is an interface between the computer and the radio when used at a
base station, and an interface between the radio and the datalogger at a field
station. In a repeater station, the RF310M is an interface between two other
communication stations. The RF310M is an RF modem. PC208W will refer to
the RF310M as either “RF Modem” or “RF95”.
3.1.1 Physical Description
The front panel of the RF310M is shown in Figure 3-1. There are two ports for
interfacing external devices. The port labeled TRANSCEIVER connects to the
radio, and the port labeled SERIAL I/O connects to the datalogger. In the case
of a repeater or phone-to-RF base station, The SERIAL I/O port will connect to
the PS512M or CH512R null modem port. The red light labeled CARRIER
DETECT is used primarily to indicate when a carrier frequency has been
detected by the radio.
3.1.2 RF310M States
The RF310M Modem operates in one of two separate states. The RF310M can
be utilized in either the RF310M-ME (Modem Enable) state or the RF310M-
SDC (Synchronous Device Communication) state. The proper state must be
determined before employing the RF310M in the field. A switch inside the
RF310M needs to be set accordingly.
The RF310M-ME state is ALWAYS used with 21X and CR7 dataloggers. The
RF310M-ME state is NORMALLY used with all dataloggers. SDC compatible
dataloggers (CR10, CR10X, CR23X, CR510, and CR500) can also use the
RF310M-SDC state. The SDC state has the advantage that a phone-to-RF base
station can have measurement capability. Only the RF310M at a phone-to-RF
base station with measurement should to be switched to the RF310M-SDC
state.
A switch with nine different dip switches is inside the RF310M; the RF310M
cover must be removed to locate the switch. The ninth switch sets the RF310M
state. The RF310M-ME state is chosen by setting the ninth dip switch open,
represented by 1. The RF310M-SDC state is chosen by setting the ninth dip
switch closed, represented by 0. Refer to Figure 3-2.