Figure 4: CXR footprint (top view)
Pin description –CXR
Pin
1a
2a
3a
4a
5a
Name
Vcc
0V
RXE
RXD
N/C (AF out)
Function
3.1 – 15V power supply
Ground
Receiver Enable (active high)
Link to 4b
No connection, 700mV p-p audio. DC coupled, approx 0.8v bias.
1b
SI
Serial frequency programming / configuration1
2b
3b
4b
5b
A (out)
B (out)
R_in
Main (latching) output
Secondary output
Link to 4a
DC level between 0.5v and 2.2v. 60dB dynamic range
RSSI
NOTES:
1. Serial programming is by an inverted, CMOS logic level, 2400 baud RS232 datastream applied
to the SI pin.
2. Do not exceed 3v logic levels on SI, A or B.
3. SI input has pullup (50K) to 3v internal rail.
4. A and B outputs are 3v cmos, active high. Up to 5mA may be drawn from each
5. CX versions can be identified by the presence of C7, on the underside of the LMR series RX
board
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 5
RADIOMETRIX [ RADIOMETRIX LTD ]
