Protocol-Specific Data - Endress+Hauser SpectraSensors J22 TDLAS Operating Instructions Manual

4900002277

Protocol-Specific Data

130
Protocol
Response times
Device type
Server address range
Broadcast address
range
Function codes
Broadcast messages
Supported baud rate
Data transfer mode
Data access
Modbus Applications Protocol Specification V1.1
• Direct data access: typically 25 to 50 ms
• Auto-scan buffer (data range): typically 3 to 5 ms
Server
1 to 247
0
• 03: Read holding register
• 04: Read input register
• 06: Write single registers
• 08: Diagnostics
• 16: Write multiple registers
• 23: Read/write multiple registers
Supported by the following function codes:
• 06: Write single registers
• 16: Write multiple registers
• 23: Read/write multiple registers
• 1 200 BAUD
• 2 400 BAUD
• 4 800 BAUD
• 9 600 BAUD
• 19 200 BAUD
• 38 400 BAUD
• 57 600 BAUD
• 115 200 BAUD
• ASCII
• RTU
Each device parameter can be accessed via Modbus
RS485.
For Modbus register information
J22 TDLAS Gas Analyzer
→  2
.
SpectraSensors, Inc.