Diagnostics
Document No. D106-009
Page 59 of 76
Revision 1.15
5.
DIAGNOSTICS
5.1.
LEDS
The module provides three LEDs for diagnostics purposes as shown in the front view figure
below. A description of each LED is given in the table below.
Figure 5.5.1 - Modbus Router front view
LED
Description
Ok
The module’s Ok LED will provide information regarding the system-level operation of
the module. Thus if the LED is red then the module is not operating correctly. For
example if the module application firmware has been corrupted or there is a hardware
fault the module will have a red Module LED.
If the LED is green then the module has booted and is running correctly.
Act
The activity LED is used for the RS232 or RS485 serial port. Every time there is a
successful Modbus routing transaction the LED will flash green. The LED will flash red
if the routing was unsuccessful (e.g. failed checksum).
Eth
The Ethernet LED will light up when an Ethernet link has been detected (by plugging in
a connected Ethernet cable). The LED will flash every time traffic was detected.
Table 5.1 - Module LED operation