ADDR
FUNC
00
06
REG H,L
00
22
COUNT H,L
00
04
CRC L,H
29
D2
ADDR
FUNC
01
03
BYTE C
06
DATA H1,L1
00
0A
DATA H2,L2
DATA H3,L3
00
00
00
CRC L,H
01
B4
78
DATA H - 0
DATA L - 4, new baud rate 19200 baud
COUNT L - the count of being read registers (max.16)
DATA H1, L1 - reg. 01h (10 - displayed value ”1.0”),
DATA H2, L2 - reg. 02h (0 - no errors),,
DATA H3, L3 - reg. 03h (1 - decimal point position ” 0.0”).
5. Read of the registers 1, 2 and 3 in one message
(example of reading a number of registries in one frame) :
The answer:
4. Change of baud rate of all devices connected to the net (BROADCAST message).
ADDR
FUNC
01
03
REG H,L
00
01
COUNT H,L
00
03
CRC L,H
54
0B
Device do not reply to BROADCAST-type messages.
There is no full implementation of the Modbus Protocol in the device. The functions presented
above are available only.
52
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ITC 450/470
User manual
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