User manual
915U-2 Wireless I/O Page 37
Page 37 User Manual
Chapter 3 - Operation
3.1 Overview
The 915U-2 range of I/O modules has been designed to provide standard “off-the-shelf”
telemetry functions, at an economic price. Telemetry is the transmission of data or
signals over a long distance via radio or twisted-pair wire cable.
3.2 Indications
When power is initially connected to the module it will perform some internal setup and
diagnostics checks to determine if the module is operating correctly. These checks will
take approximately 40 seconds. The table below shows the correct LED sequences.
3.2.1 Front Panel Indications
LED Indicator
Condition
Meaning
PWR
GREEN
System OK
PWR
Fast Flash
System Boot – Stage 1
PWR
SLOW Flash
System Boot – Stage 2
PWR
RED
System Boot – Initial / System Failure
RF
GREEN
Transmitting Radio data
RF
RED
Receiving Radio data
232
GREEN
Transmitting RS232 data
232
RED
Receiving RS232 data
232
ORANGE
Transmitting and Receiving RS232 data
485
GREEN
Transmitting RS485 data
485
RED
Receiving RS485 data
3.2.2 Boot Sequence “PWR” LED Indications
Reset
Green LED
Red LED
Green/Red (Orange Colour) LED
Green/Red Fast Flash (Boot Stage 1)
Green/Red Slow Flash (Boot Stage 2)
Normal OperationNormal Operation
Normal Reset
5Sec
17Sec 25Sec 48Sec
Figure 22 - Boot Sequence