Radiometrix Ltd

PLT/PLR Data Sheet

page 4

Figure 3: PLT footprint (top view)

Pin description – PLT

Pin

Name

Function

1a

Vcc

3.1 – 15V power supply (@ 10mW)

4.1 – 15V power supply (@ 100mW)

2a

0V

Ground

3a

TXE

Transmit Enable (active low)

4a

TXD

(link to 4b)

1b

CMD

Command mode select input

2b

DATA

Serial data out/in

3b

FLOW

Buffer full / busy output

4b

(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

VCC (1a)

GND (2a)

(3a)

TXD (4a)

TXE

T

ransmit enable (active low)

3.1- 15V

Antenna

2

3

TXD

Vc c

SGD

4

6

7

8

9

5

PLT2

(0-3V)

Figure 4 : Typical RS232 interface for programming and data input