4900002277 J22 TDLAS Gas Analyzer
130 SpectraSensors, Inc.
Protocol-Specific Data
Protocol
Modbus Applications Protocol Specification V1.1
Response times
• Direct data access: typically 25 to 50 ms
• Auto-scan buffer (data range): typically 3 to 5 ms
Device type
Server
Server address range
1 to 247
Broadcast address
range
0
Function codes
• 03: Read holding register
• 04: Read input register
• 06: Write single registers
• 08: Diagnostics
• 16: Write multiple registers
• 23: Read/write multiple registers
Broadcast messages
Supported by the following function codes:
• 06: Write single registers
• 16: Write multiple registers
• 23: Read/write multiple registers
Supported baud rate
• 1 200 BAUD
• 2 400 BAUD
• 4 800 BAUD
• 9 600 BAUD
• 19 200 BAUD
• 38 400 BAUD
• 57 600 BAUD
• 115 200 BAUD
Data transfer mode
•ASCII
•RTU
Data access Each device parameter can be accessed via Modbus
RS485.
For Modbus register information
→ 2.
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