General Manual BG41/BG42/BG43
3-2 Rev. 99/49
3.1.2 LED indicators on the modules
The interface modules are equipped with LEDs. It is possible to determine the type of module or
inserted building block being used on the interface by the colour of the LED.
In this chapter the significance of the LED indicators are described in connection with the respective
modules.
Type of Module Order LED
No. 1 2 3 4
20mA Current Loop
MD25 red
(receive)
red
(send)
20mA Current
Loop/RS232C
Combination
MD26 red
(receive)
red
(send)
RS232C
MD22 green
(receive)
green
(send)
RS422 / RS485
MD21 yellow
(receive)
yellow
(send)
RS422P
MD33 yellow
(receive)
yellow
(send)
RS485P
MD34 yellow
(receive)
yellow
(send)
CENTRONICS
MD24 red
(error)
green
(error-free)
SSI MD39
5V/24V Counter
MD18 green
(power on)
yellow
(Z3:CY/BW)
yellow
(Z2:CY/BW)
yellow
(Z1:CY/BW)
Analogue Input MD40-MD44
Analogue Output MD45-MD49
DCF77 Antenna MD36 green
(receive)
red
(status)
Tab. 3-1: LED-indicators on the modules
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