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9
Mailbox
This chapter contains all the necessary information to operate in a Mailbox.
9.1
Mailbox
9.1.1
Construction
If an AS-i slave is addressed in a command or in a response, the address is struc-
tured as shown below:
byte
1
2
3
...
24
byte
1
2
3
...
24
Command byte and T-bit are always part of the response. The T-bit is necessary
to operate the mailbox. In that way the same mailbox command can be used two
times directly one command after the other with different parameters.
The execution of a mailbox is declined, if the mailbox is too small.
Circuit = 0 If AS-i gateway with one AS-i master or the master 1 of an AS-i gate-
Circuit = 1 If AS-i gateway with 2 masters and the master 2 is choosen.
The commands for reading and writinig exist in 2 variants. By the first variant the
bits in the slave lists are arranged, so that the data for slave with lower address
appear in the lower bits. The second variant is compatible to Siemens masters, by
which the sequence of the bits in the slave lists bytes are inverse.
Between the 2 variants can be changed with bit 2
Siemens compatibility bit 2
Subject to reasonable modifications due to technical advances.
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7
6
5
2
2
2
T
–
request parameter byte 22
7
6
5
2
2
2
T
response parameter byte 1
response parameter byte 22
way with 2 masters is choosen.
6
should not be deleted.
AS-i/CC-Link Gateway
Request
4
3
2
2
command
circuit
request parameter byte 1
...
Response
4
3
2
2
command
result
...
6
in byte 2 of the request. For
Copyright Pepperl+Fuchs, Printed in Germany
Mailbox
2
1
0
2
2
2
2
1
0
2
2
2
31
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