UNION Instruments GmbH
INCA Analyzer Series
– Instruction Manual
Page 44 of 59
Output option
6.2
H-Bus protocol (Master-Slave)
6.2.1
Data structure
Communication with analyzer with a protocol with the following data structure:
Figure 6-2: H-Bus data structure
Maximum N
: 256
Configuration RS-232 : 2400 or 9600 Baud, 8 Databit/n, 1 Stopbit, no parity
The DataPackage contains commandos and eventually used data which should be
transferred.
Coding of the data is in Intel format (Little Endian). The CRC16 is included only for H-Bus.
For Profibus-DP
Output buffer
5 words (10 Bytes)
2-word-command; 3-word-command
Address
Adjustable in the module (DIP-switch)
For Modbus RTU
Output buffer
5 words
2-word-command; 3-word-command
2-word-command
Register number 1025, 1026
3-word-command
Register number 1027, 1028, 1029
Address & Baud rate Adjustable in the module (DIP-switch)
Caution
Profibus-DP/Modbus RTU use Baudrate of 9600 Bits/s. The setting is done
through the display: Menu
Settings
Communication
H-Bus (9600).
Under this setting, communication with INCACtrl is not possible.
6.2.2
Commands description
Note
The following information in brackets indicates the difference of Profibus-DP/
Modbus from direct RS-232 communication.
Note
Communication using Profibus-DP/Modbus RTU does not need CRC16
calcula-tion of bus-master since we use CRC16 calculation of Profibus-
DP/Modbus RTU slave.
Block length N
WORD
DATA
N*WORD
CRC16
WORD
Not included in the
data structure of
Profibus-DP
