IDL 101
COMMUNICATION
78
HB_IDL101_E_V222.doc
Gantner Instruments Test & Measurement GmbH
Read Holding Register
Description
:
With this command input/output registers (read/write registers) can be read.
ADR FNR
request telegram
03
REGSTA
MSB LSB
REGNUM
MSB LSB
CRC
MSB LSB
ADR FNR
response telegram
03
BYTNUM D0 CRC
MSB LSB
D1 ... Dn
ADR ..................... IDL 101 address (
hex
00..7F)
FNR ..................... function number (
hex
03)
REGSTA ............... address of the first register to be read
REGNUM .............. number of registers to be read
BYTNUM .............. number of databytes (max. 64)
D0 - Dn ................ databytes (max. 64)
CRC ..................... check sum
CRC polynomial: u
15
+ u
13
+ 1
CRC start value:
hex
FFFF
Read Input Register
Description
:
With this command input registers (read only registers) can be read.
ADR FNR
request telegram
04
REGSTA
MSB LSB
REGNUM
MSB LSB
CRC
MSB LSB
ADR FNR
response telegram
04
BYTNUM D0 CRC
MSB LSB
D1 ... Dn
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