ICON LevelPro ITC 450 Series Quick Start Manual page 23

LevelPro — ITC 450 & 350 Series
®
Tank Level Display + Controller
RS485 Modbus Programming
5. Read of the registers 1, 2 and 3 in one message (example of reading a number of
registries in one frame):
ADDR
01
COUNT L
The answer:
ADDR
01
DATA H1, L1
DATA H2, L2
DATA H3, L3
i
24-0352 © Icon Process Controls Ltd.
FUNC REG H,L
03 00 01
- the count of being read registers (max.16)
FUNC BYTE C DATA H1,L1
03 06 00
- reg. 01h (10 - displayed value "1.0"),
- reg. 02h (0 - no errors),,
- reg. 03h (1 - decimal point position " 0.0").
There is no full implementation of the Modbus Protocol in the device. The
functions presented above are available only.
COUNT H,L CRC L,H
00 03 54
DATA H2,L2 DATA H3,L3
0A 00 00 00
0B
CRC L,H
01 78 B4
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