bihl+Wiedemann AS-i/Modbus Gateway, User Manual, Page: 42 / 60

AS-i/Modbus Gateway Operation via Modbus
Subject to reasonable modifications due to technical advance. Copyright Bihl+Wiedemann, Printed in Germany
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D = 4: force listen only mode
The Modbus slave is set to Listen Only Mode . All following telegrams
except restart comm option are ignored. For correct function I
q
must
hold the value 0000
hex
.
After power-on-reset the Listen Only Mode is switched off.
D = 10: clear counters and diagnostic registers
The Modbus error counters will be reset.
D = 11: return bus message count
The response data field returns the quantity of messages that the
slave has detected on the communication system since its last re-
start, clear counters operation or power-up.
D = 12: return bus CRC error count
The response data field returns the quantity of CRC errors encoun-
tered by the slave since its last restart, clear counters operation, or
power-up.
D = 13: return bus exception error count
The response data field returns the quantity of Modbus exceptions re-
sponses returned by the slave since its last restart, clear counters op-
eration, or power-up.
D = 14: return slave message count
The response data field returns the quantity of messages addressed
to the slave, or broadcast, that the slave has processed since its last
restart, clear counters operation, or power-up.
D = 15: return slave no response count
The response data field returns the quantity of messages addressed
to the slave for which it returns no response (neither a normal re-
sponse nor an exception response), since its last restart, clear
counters operation, or power-up.
For formal reasons also the diagnostic codes 16, 17 and 18 (“ return slave NAK count ”,
“ return slave busy count ” and “ return bus character overrun count ”) were returned, but
with the value zero.
2
8 host interface flag “ Data_Exchange_Active ”
2
9
host interface flag “ Off-line ”
2
10
host interface flag “ Auto_Address_Enable ”