
L-INX/L-GATE User Manual
65
LOYTEC
LOYTEC electronics GmbH
6.4.4 MSTP Activity LED
The MS/TP port has a three-color MSTP Activity LED (see product installation sheet). Table
5 shows the different LED patterns of the port and their meaning. A permanent color reflects
a state. Flicker is for 25 ms when there is activity on the MS/TP data link layer.
Behavior
Description
Comment
GREEN permanently,
flicker off
Multi-Master, token ok, flicker when traffic
Normal condition on a multi-master
MS/TP network.
ORANGE flicker
Sole master, flicker when traffic
Normal condition on a single-master
MS/TP network.
RED permanent, flicker
GREEN
Token lost state, flicker when transmit
attempt
Cable might be broken.
RED flash fast
Transmission or receive errors
This indicates bad cabling.
Table 5: MS/TP Activity LED Patterns.
6.4.5 Modbus LED
The Modbus LED is a three-color LED. Table 6 shows the different LED patterns of the port
and their meaning. Flicker is for 25 ms when there is activity on the bus.
Behavior
Description
Comment
GREEN flicker
Traffic, transmission successful
Normal condition.
RED flicker
Traffic, transmission unsusccesful
Device not responding or other
network error.
Table 6: Modbus Activity LED Patterns.
6.4.6 EXT LED
The EXT port has a three-color LED (see product installation sheet), which displays link and
traffic information on the protocol enabled on the port (M-Bus or KNX TP1). Table 7 shows
the different LED patterns of the port and their meaning. A permanent color reflects a state.
Flicker is for 25 ms when there is activity on the attached network. The LGATE-951/952 and
the LINX-153 have more than one EXT port that all conform to the described behavior.
Behavior
Description
Comment
GREEN permanently,
flicker off
LKNX-300 attached, flicker when traffic
Normal condition on a KNX TP1
network.
GREEN flash fast
M-Bus traffic
Normal condition on an M-Bus
network.
RED permanent
LKNX-300 not attached, no KNX bus
power or port damaged
Check if cabling to LKNX-300 is
bad.
RED flash fast
M-Bus transmission or receive errors
This indicates bad cabling. Check if
L-MBUS is connected. Check if
M-Bus devices are operational.
Table 7: EXT port LED Patterns.
6.4.7 Ethernet Link LED
The Ethernet Link LED lights up green whenever an Ethernet cable is plugged-in and a
physical connection with a switch, hub, or PC can be established.
6.4.8 Ethernet Activity LED
The Ethernet Activity LED lights up green for 6 ms whenever a packet is transmitted or
received or when a collision is detected on the network cable.