SECTION 3. RADIOTELEMETRY NETWORK COMPONENTS
3-4
not respond during this time, a “Bad Link” error
messages is returned. The RFBase marks that
remote as bad and will return a “Bad Link”
message each time the computer attempts to
send packets to that site. The RFBase will
continue to include the failed remote as part of
the polling process. If the remote ever responds
to a poll, a “Communication restored” message
will be sent, and the RFBase will again accept
direct maintenance packets for that remote.
3.1.8 RF95T CONNECTIONS
The 9-pin Serial I/O connector is normally used
to connect the RF95T to the datalogger,
PS512M, or CH512R. Table 3-4 describes the
9-pin connections. The 10-pin rectangular
connector is for connection to the transceiver.
Table 3-6 contains the pinout for the radio to
modem cable descriptions.
TABLE 3-4. Serial I/O Connector Description
Pin
Description
1
+5 V: Supply from external source
2
GND: Ground
3
Ring: Ring to datalogger
4
RXD: Transmit from RF95T
5
ME: Modem Enable from datalogger
6
Printer Enable: Not used
7
Unload Enable: Not used
8
Tape Enable: Not used
9
TXD: Received by RF95T
3.1.9 RF95T CURRENT DRAIN
Quiescent
1.4 mA
Wait *
3-4 mA
Active
30 mA
* Waiting to respond to broadcast.
Usually the radio current drain is the relevant
factor in battery power calculations.
3.2 RF100/RF200 RADIOS
3.2.1 RADIO DESCRIPTION
The RF100 and RF200 are used in Campbell
Scientific's RF applications to transmit and
receive data blocks. The radios shipped from
Campbell Scientific are secured on a mounting
bracket designed to fasten on the top of the RF
modem (see Figure 3-3).
The mounting bracket also supports a BNC
Jack connector from the radio. The coax cable
that is required to connect the radio to its
antenna should be connected to the radio at this
BNC connector. See Section 3.3 for more
information on the antenna cable.
The RF100/RF200 Radios are connected to the
RF modem by a special radio cable. The first
10-pin connector on this radio cable has a red
and black wire coming out of the connector.
This is the 10-pin connector (labeled "radio")
that should be connected to the radio. The red
and black power wires should be connected to
12V and Ground respectfully. The second 10-
pin connector (labeled "modem") should be
connected to the RF modem. Table 3-6
contains the pin out of this radio cable.
FIGURE 3-3. RF100 On Bracket with Connector
