Figure 3: PLT footprint (top view)
Pin description – PLT
Pin
1a
Name
Vcc
Function
3.1 – 15V power supply (@ 10mW)
4.1 – 15V power supply (@ 100mW)
Ground
Transmit Enable (active low)
(link to 4b)
2a
3a
4a
0V
TXE
TXD
1b
2b
3b
4b
CMD
DATA
FLOW
Tout
Command mode select input
Serial data out/in
Buffer full / busy output
(link to 4a)
Notes:
1. This pinout is very similar to the LMT 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 pin (2b).
3. TXE has a 100kΩ pullup to Vcc
4. All pins are on an 0.1" grid
5. In the 'off' state a PIN switch open circuits the RF output pin. There are no 'off' state spuri.
6. 10mW unit will operate (with marginally reduced specifications and lower (6-8mW) output power)
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.
7. 100mW versions should not be run continuously from supply voltages > 9v
8. Do not exceed 3v logic levels on any input (4v for 100mW PLT units)
Application circuit
Antenna
3.1- 15V
VCC (1a)
GND (2a)
TXE(3a)
T
ransmit enable (active low)
TXD (4a)
1
PLT2
6
7
8
9
Vcc
2
3
TXD
(0-3V)
4
5
SGD
Figure 4 : Typical RS232 interface for programming and data input
Radiometrix Ltd
PLT/PLR Data Sheet
page 4
RADIOMETRIX [ RADIOMETRIX LTD ]
