LabVIEW drivers - FLOWBUS (Bronkhorst) protocol

The underlaying communication principle is even simpler:

Control commands

# Initialisation RS232 interface
SEND               RECEIVE          COMMENT
:050001000A49      :04000000xx      Init instruction for node 0 process 0
:050001000101      :04000000xx      PNA (Primary Node Address) = 1
:05000100027F      :04000000xx      SNA (Secondary Node Address) = 1
:050001000302      :04000000xx      NNA (Next Node Address) = 1
:050001000420      :04000000xx      LNA (Last Node Address) = 32 1 for 1 module?
:050001000502      :04000000xx      BM (Bus Master) = 2 (default) or = 1 (temporary)
:050001000A52      :04000000xx      Reset instruction for module

# explanation of the abovementioned messages
1  ':' start character
2  05  Length
3  01  Node address
4  01  send parameter
5  00  process number
6  aa  initialisation step
7  bb  parameter value
8  \r
9  \n

# Stop communication on RS232 interface
SEND               RECEIVE          COMMENT
:050101001101      (nothing)        Close communication instruction

# Read flow from process 1 node 1
SEND                   RECEIVE               COMMENT
:06010402200120\r\n    
:0601010120hhll\r\d   hh high byte ll low byte

# explanation of the abovementioned SEND message
Nr Byte Description
1  ':'
2   06  Length (':', length byte and '\r\n' not included)
3   01  Node 1
4   04  ask for parameter
5   02  Process number source (destination +1)
6   20  Parameter number (=0: process value) and type (=2: integer)
7   01  Process number destination
8   20  Parameter number and type
9   \r
10  \n

See also