USER MANUAL SWG
Page 100 of 129
9.
Specification Modbus via RS485 specification
0016
9.1.
General information
The Modbus (slave function) requires the firmware version V1.01.70 dated
17.11.2014 or later.
The analysers are able to work as modbus slave using the RS232 or RS485 port
(possibly with external RS232/RS485 adapter)
supports RS485 interface with 2/4 wires (half/full duplex)
supports only the binary Modbus protocol (RTU)
supports modbus command
Read Holding Register
(command no 3)
supports modbus command
Read Input Register
(command no 4)
the slave modbus address is user definable from 1 to 238
communication parameter are user definable as follows:
- 9600 baud
- 19200 baud
- even parity and 1 stop bit
- no parity and 2 stop bits
Multi byte values are transmitted in Motorola
®
byte order (Big-Endian). Only the
CRC16 at the end of each frame is transmitted in Intel
®
byte order (Little-
Endian).
In case you need Little-Endian byte order in the master's system:
- 16bit values (occurs only in the frame): swap bytes 0<=>1
- 32bit values (occurs only in the data): swap bytes 0<=>3 and swap bytes
1<=>2
All adresses written in this document are decimal (not hexa-decimal)
All readable data are 32bit values, therefore the analyzer only accepts even
addresses end even number of registers to be read.
The maximal number of 32bit-values to be read with one single read command is
63
(126 modbus registers)
Data types (used in table below):
U32
295)
FL
32 bit floating point value (reads -1E38, when not available).
Summary of Contents for SWG 100 SYNGAS
Page 1: ...SWG 100 SYNGAS USER MANUAL ...
Page 12: ...USER MANUAL SWG Page 12 of 129 11 H3PO4 inlet G1 8 inner thread ...
Page 24: ...USER MANUAL SWG Page 24 of 129 ...
Page 32: ...USER MANUAL SWG ...
Page 63: ...USER MANUAL SWG Page 63 of 129 Detail A Alarm Relais ...
Page 89: ...USER MANUAL SWG Page 89 of 129 8 3 Description of the analyser 1 1 1 1 2 ...
Page 99: ...USER MANUAL SWG Page 99 of 129 ...
Page 110: ...USER MANUAL SWG Page 110 of 129 12 Appendix ...
Page 114: ...USER MANUAL SWG Page 114 of 129 ...
Page 116: ...USER MANUAL SWG Page 116 of 129 Positions of the components 3 4 ...
Page 127: ...USER MANUAL SWG Page 127 of 129 ...
Page 129: ...USER MANUAL SWG Page 129 of 129 ...