Munters MUX 2 - Troubleshooting

© Munters AB, 2014 8
Cross wire the RS-232 communication 3-wire cable:
• The RS-232 TX (output) terminal connects to the Controllers RX (input) terminal.
• The RS-232 RX (input) terminal connects to the Controllers TX (output) terminal.
• The third wire connects the RS-232 COM Communication Box and Controllers.
2.6 Troubleshooting
In case of a communication problem:
1. Open the unit.
2. Locate the LEDs and refer to the following chart.
LED
State
Definition
D10
On
OFF
Power OK
Problem with the power supply
D1
Blinking
Steady On or Off
Incoming RS
-232 data from modem.
No
RS-232 data from modem.
D3
Blinking
Steady On or Off
Incoming data from PC.
No data from PC.
D9
Blinking
Steady On or Off
RS
-232 data sent to controllers.
No RS
-232 data to controllers
D2
Blinking
Steady On or Off
RS
-232 data sent to modem.
No RS
-232 data to modem
D4
Blinking
Steady On or Off
RS
-232 data to PC.
No RS
-232 data to PC