Figure 6: PLR footprint (top view)
Pin description –
PLR
Pin
1a
2a
3a
4a
5a
1b
2b
3b
4b
5b
Name
Vcc
0V
RXE
RXD
N/C (AF out)
CMD
DATA
FLOW
R
in
RSSI
Function
3.1 – 15V power supply (@ 10mW)
Ground
Receiver Enable (active high)
(link to 4b)
700mV p-p audio. DC coupled, approx 0.8v bias
Command mode select input
Serial data out/in
Valid data/serial output in progress
(link to 4a)
DC level between 0.5v and 2.2v. 60dB dynamic range
NOTES:
1. This pinout is very similar to the LMR radios but the serial data is on pin 2b (not 1b, which is here
used as the command mode select input )
2. Serial programming is by an inverted, CMOS logic level, 9600 baud RS232 datastream applied to
the DATA (2b) pin.
3. All pins are on an 0.1" grid
4. Unit will operate (with marginally reduced specifications) from a 3.0v rail. This must be well regulated
and without noise or ripple, as in this state the unit's internal regulator no longer operates, and
provides no supply rejection
5. Do not exceed 3v logic levels on any input
Application circuit
Antenna
3.1- 15V
(3V)
Receiver enable (active high)
NC
Vc c
PC serial port
PLR2
NC
RXD
T
XD
2
SGD
Figure 7: Typical RS232 interface for programming input and data output
Radiometrix Ltd
PLT/PLR Data Sheet
page 6
1
3
4
5
6 Data
7
8 PGM
9
S
W1
(0-3V)
RADIOMETRIX [ RADIOMETRIX LTD ]
