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Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
DP module 12: extended command channel
Commands in the extended command channel
259
11.3.18
Module 12, acyclic command 36 (24hex) – standard read
call to an AS-i slave with CTT2 profile
5755
– Available from master profile M4 onwards –
CTT2 profiles = S-7.5.5, S-7.A.5 or S-B.A.5
Request from fieldbus master to device
Bit
Offset
Word no.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
res.
S
M
UID
command number = 36
dec
= 24
hex
2
res. = 0
ST
SLA
reserved = 0
3
res. = 0
DL
IX
4...18
not used
not used
Legend:
S
sequence bit
1 bit
a large data packet is transmitted in several partial sequences:
0 = data transmission completed
1 = data transmission not yet completed, at least one more packet follows
M
master no.
1 bit
0 = master 1
1 = master 2
UID
user ID
5 bits
00…1F
hex
= 0…31
dec
(a change to the user ID starts the command call)
ST
slave type
1 bit
0 = A slave
1 = B slave (addition of 20
hex
or 32
dec
to the slave address)
SLA
slave address
5 bits
00…1F
hex
= 0…31
dec
DL
data length
6 bits
number of bytes to be transferred
permitted values: 01…20
hex
= 01…32
dec
(
data sheet of the slave)
IX
index
1 byte
pointer to the page to be read
permitted values: 00…FF
hex
= 0…255
dec
(
data sheet of the slave)
