Figure 3: CXT footprint (top view)
Pin description –CXT
Pin
1a
2a
3a
4a
Name
Vcc
0V
N_TXE
TXD
Function
3.1 – 15V power supply
Ground
Transmit Enable (active low)
Link to 4b
1b
SI
Serial frequency programming / configuration1
2b
3b
4b
A (in)
B (in)
T_out
Main (latching) input
Second (cancel) input
Link to 4a
Notes:
1. Serial programming is by an inverted, CMOS logic level, 2400 baud RS232 datastream applied to
the SI pin.
2. TXE has a 100kΩ pullup to Vcc
3. Do not exceed 3v logic levels on SI, A or B.
4. SI input has pullup (50K) to 3v internal rail.
5. A and B inputs have pullups (50K) to 3v internal rail. (A, B inputs: active low)
6. CX versions can be identified by the presence of C7, on the underside of the LMT series TX board
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 4
RADIOMETRIX [ RADIOMETRIX LTD ]
