T H E M O D E R N M - B U S T E C H N O L O G Y
PiiGAB Process Information i Göteborg AB
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2.9.5
Adapter 4 and 5: Spy
All the traffic that are being sent and received on the M-Bus port are mirrored to
the serial port. This results in that you can connect a serial analyzer or monitoring
software. To be able to read what is being written and read two communication
ports are demanded on your computer.
Through using adapter 4 and 5 monitoring can be done. Adapter 4 is used to
monitor the question and adapter 5 is used to monitor the answer.
The two adapter’s module cables are connected via a branch and onto the
gateway’s RJ-12 contact.
Table 2-8. Connection for adapter 4 (Ethernet request)
9-pin DSUB/F
RJ12/F
Pin 2 (RxD)
Pin 3
Pin 5 (GND)
Pin 1
Table 2-9. Connection for adapter 5 (M-Bus response)
9-pin DSUB/F
RJ12/F
Pin 2 (RxD)
Pin 2
Pin 5 (GND)
Pin 1