User's Manual

05-3946A01, Rev. C TransNET OEM Integration Guide 59
9.2 LED Indicators
The LED indicators on the transceiver board (CR3, CR-4, CR-5 and CR-6)
are an important troubleshooting tool and should be checked whenever a
problem is suspected. Table 24 describes the function of each status LED.
Table 24. LED indicator descriptions
LED Name Description
RXD (CR3)
Receive Data
Serial receive data activity. Payload data from con-
nected device.
TXD (CR4)
Transmit Data
Serial transmit data activity. Payload data to con-
nected device.
DCD (CR5)
Data Carrier Detect
Continuous—Radio is receiving/sending synchroni-
zation frames
On within 10 seconds of power-up under normal
conditions
GP (CR6)
General Purpose
• Continuous—Power is applied to the radio; no
problems detected
• Flashing (5 times-per-second)—Fault indication. 
See “TROUBLESHOOTING” on Page 57
• Off—Radio is unpowered or in Sleep mode
RXD
TXD
DCD
GP