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BRONKHORST®

Details and meaning can be found in document 9.17.023 Operation instructions digital instruments.

This document can be found at:

http://www.bronkhorst.com/en/downloads/instruction_manuals/

• Access indicates whether parameter can be Read and/or Written.

• When a byte parameter is read, the upper 8-bits of the Modbus register will be 0. When a byte

parameter is written, the upper 8-bits must be set to 0.

• Long integer parameters have a length of 4 bytes and are mapped on two consecutive Modbus

registers. The first register contains bit 32-16, the second register contains bit 15-0.

• Floating point parameters have a length of 4 bytes and are mapped on two consecutive Modbus

registers. Floats are in single precision IEEE format (1 sign bit, 8 bits exponent and 23 bits fraction).

The first register contains bit 32-16, the second register contains bit 15-0.

• String parameters can have a length of maximal 16 bytes and can take up to 8 Modbus registers

where each register contains two characters (bytes). The upper byte of the first register contains

the first character of the string. When writing strings, the write action should always start from the

first register as a complete block (it is not possible to write a part of a string). If the string is shorter

than the specified maximum length the string should be terminated with an 0.

• Parameters Temperature, Counter value and Counter limit can be found in the parameter table as

an unsigned integer variant and as a floating point variant. Only the floating point variant supports

the full parameter range and resolution.

MODBUS REGISTERS

PARAMETER NAME

PARAMETER

TYPE

ACCESS

PDU ADDRESS REGISTER NUMBER

REMARK

Hex Dec Hex Dec

Usertag

String (13 bytes)

0xF130..0xF136

61744..61750

0xF131..0xF137

61745..61751

PID-Kp

Float



0xF2A8..0xF2A9

62120..62121

0xF2A9..0xF2AA

62121..62122

PID-Ti

Float



0xF2B0..0xF2B1

62128..62129

0xF2B1..0xF2B2

62129..62130

PID-Td

Float



0xF2B8..0xF2B9

62136..62137

0xF2B9..0xF2BA

62137..62138

Density actual

Float

0xF478..0xF479

62584..62585

0xF479..0xF47A

62585..62586

Dynamic display factor

Float



0xF508..0xF509

62728..62729

0xF509..0xF50A

62729..62730

Static display factor

Float



0xF510..0xF511

62736..62737

0xF511..0xF512

62737..62738

Exponential smoothing

Float



0xF520..0xF521

62752..62753

0xF521..0xF522

62753..62754

Modbus baudrate

Long integer



0xFD48..0xFD49

64840..64841

0xFD49..0xFD4A

64841..64842

Page 20 Modbus interface 9.17.035

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