Radiometrix Ltd

TXL2/RXL2 Data Sheet

page 3

8 holes of 0.7mm dia.

pin spacing 2.54mm (0.1")

12

3

4

5

6

7

8

7mm

42mm

18mm

15.24mm (0.6")

0.3"

1 = RF gnd

2 = RF out

3 = RF gnd

4 = En

5 = Vcc

6 = GND

7 = TXD

8 = SETUP

TXL2

TXL2 Pin description

Pin

Name

Function

1

RF GND

RF ground

2

RF out

50Ω RF output to the antenna

3

RF GND

RF ground

4

EN

Pull high to enable module (may be tied to Vcc)

5

Vcc

5V regulated power supply (4.75 – 5.25V)

6

GND

Supply ground

7

TXD

Inverted RS232 input (5V CMOS logic, No pullup)

8

TEST/SETUP Pull low to enter test/setup mode (5V CMOS logic, Pullup to 5V)

Notes:

1. TEST has 47K pullup to Vcc. TXD has none. EN has a 47K pulldown

2. Vcc must be a 5v regulated supply (4.75 - 5.25v)

3. Pinout is similar to TX1H, with the addition of pin 8 (located 7.62mm on from pin 7)

4. TXD is inverted RS232 at 5v cmos levels. To connect to a true RS232 device, inverting a level shifter must be

used (MAX232 type are ideal, but simple NPN transistor switches with pullups often suffice). With typical

microcontrollers and uarts, direct connection is possible.

5. The TXL2 provides transmit side of a simplex link, but provided no two devices attempt to transmit at one

time, no further restrictions on data transmission need be made, as all transmit timing, valid data identification

and datastream buffering is conducted by the unit. There is no 'transmit enable' pin.

6. This unit is compatible with the RXL2 receiver and the TDL2A transceiver

7. A simple addressing structure is included in the datastream. Units may be programmed onto one of eight

addresses (all units are supplied set to default ADDR=0 and default channel=0, 433.925MHz)

Figure 3: TXL2 footprint