BRONKHORST®
9.17.061
EL-FLOW
Base
Series Mass Flow Controllers
Page 29
3.9 Basic Parameters and Properties
3.9.1 Introduction
Every parameter has its own properties. These properties are given in a table as shown:
Type
Access
Range
FlowDDE
FlowBus
ModBus
[type]
RW
[x]…[y]
[FB]
[Pro]/[Par] [address]/[index]
Type
Unsigned char
1 byte character
Unsigned char[x] x byte array (string)
Unsigned int
2 byte unsigned integer
Float
4 byte floating point
Access
R
The parameter is read-only
RW
The parameter can be read and write
RW
The parameter can only be written when the Init Reset parameter is set to 64. See Chapter
4.1.1, General Product Information for more details.
Range
Some parameters only accept values within a certain range:
[x]
Minimal value of the range.
[y]
Maximal value of the range.
FlowDDE
Parameter number in FlowDDE. Check chapter
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4, “
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source not found.
”, for detailed information.
FlowBus
Process and parameter number to address parameters using the FlowBus protocol.
[Pro]
Flowbus process number
[Par]
Flowbus parameter number
Check document 9.17.027 , “RS232 interface with FLOW-BUS protocol”, for detailed information.
ModBus
PDU Address and register number to address parameters using the ModBus protocol.
[address]
Hexadecimal PDU address .
[index]
Decimal register number.
For the ModBus protocol every 2 bytes are addressed separately. Check chapter 3.55, “Modbus RS485
operation” for more details.
