Connecting the diagnostic bus
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AED9301B HBM
3.5 Connecting the diagnostic bus
The diagnostic bus is used to analyze dynamic processes. The bus is set out as an RS485
2-wire bus (lines: TB/RB and TA/RA, GND).
Fig. 3.5-1: Connecting the diagnostic bus via terminal KL3
The interfaces setting of the bus is defined and cannot be changed (38400 bit/s, 8E1).
External bus termination resistances are not necessary for this bus.
The HBM interface converter can be used to connect the RS485 bus to an (RS232) COM
port of the PC.
The ground of the interface driver is related to the GNDext terminal. The interface driver of
the master should be also connected to this GNDext.
Only a connecting cable with a screen grounded on two sides should be used as the inter-
connecting cable between the AED 9301B and the bus and the master (see also:
AED9301B cable connection via a PG gland).
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