Communication Principles; Internal Interface; Leds For Bsp And Bus Diagnostics - Siemens IQHeat User Manual

2 Communication principles

2.1

Internal Interface

A ModBus interface is always available in the processing unit. The RS485 interface can be defined as master
or slave; if both master and slave are required, a communication module must be connected with ModBus.
The TCP/IP interface is always the slave – both can be switched off.
2.1.1

LEDs for BSP and BUS diagnostics

The processing unit has two LEDs, BSP and BUS, for diagnostics. The LEDs can light with three different
colours: yellow, green and red.
BSP indicates the status of the internal program in DDC1.
BUS indicates the status of the external communication.
BSP LEDs Start/Stop
Mode
Software update mode (download of
application or new software)
No application is loaded
Application loaded but is not in operation
Application is in operation
BSP error (software error)
Hardware error
Status LED BSP
LED BSP lights every second alternating between red and
green
Yellow LED flashing, lights 50 ms and off 1,000 ms
Yellow LED lights
Green LED lights
Red LED flashes at 2 Hz
Red LED lights
5
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