Table 6-2: RS-232 pinout
Pin
I/O
Description
1
2
O
TX
3
I
RX
4
5
GND
6
7
8
O
CTS
9
I = Signal into the radio, O = Signal out of the radio
6.6 LEDs
The radios have a red LED labeled TX/PWR and a green LED labeled RX. When 12V power is
applied, both LEDs turn on for about one second.
The red LED indicates when the receiver is actively listening. It will flash in correlation with the
Power Mode; that is, Always On, 0.5 Sec, 1 Sec, or 4 Sec. When the radio is transmitting, the red
LED will flash (it will not be on solid).
Green LED activity indicates that there is an RF signal being received.
6.7 Antenna
The radio has a reverse polarity SMA (RPSMA) jack antenna connection. It is important to note
the distinction between RPSMA and SMA connectors when selecting a compatible antenna or
antenna cable. See
www.campbellsci.com/blog/ins-outs-rf-connectors
for more information.
6.7.1 Compatible antennas
Campbell Scientific offers antennas to satisfy the needs for various base station and remote
station requirements. All antennas (or antenna cables) that attach directly to the radio have an
RPSMA plug connector. The use of an unauthorized antenna could cause transmitted field
strengths in excess of FCC rules, interfere with licensed services, and result in FCC sanctions
against the user.
RF407-Series Spread Spectrum Radio
16
