Illustration
Pin no.
Signal
Direction
Description
Four-wire mode
Two-wire mode
1
8
1
2
R-
-
In
Four wire: Receive
3
T-
T-/R-
Out/In
Four-wire: Transmit
Two-wire: Transmit/Receive
4
5
R+
In
Four-wire: Receive
6
T+
T+/R+
Out/In
Four-wire: Transmit
Two-wire: Transmit/Receive
7
8
Table 5. RS-485 port pinout
3.4.3. Console Port
The router has a USB console port with a type C connector. The router acts as a device.
3.4.4. Antennas
The router has three SMA connectors. They are:
• Two LTE antennas for the mobile radio - a MAIN and an AUXiliary
• Single antenna for GNSS/GPS
3.4.5. Reset Button
Use the reset button to request a system reset. When pressing the reset button, all LEDs turn on
simultaneously. The length of time holding the reset button will determine its behaviour.
Press duration
PWR/CONFIG
LED behaviour
Router behaviour on depress
0-3 seconds
Solid on
Normal reset to running config. No special LED activity.
3-15 seconds
Flashing fast
Releasing 3-15 seconds switches the router back to factory configuration. Note: this
will wipe the configurations, both config1 and config2.
15-20 seconds
Solid on
Releasing 15-20 seconds performs a normal reset to running config.
20-30 seconds
Flashing slowly
Releasing 20-30 seconds reboots the router to recovery mode. Only to be done in
case of emergency and under the guidance of Westermo support staff. Note: this may
wipe the configurations, both config1 and config2.
> 30 seconds
Solid on
Releasing after 30 seconds performs a normal reset.
Table 6. Merlin series router reset behaviour
12
Merlin 4400 Series
