Bronkhorst RS232 interface User Manual download pdf (Page 12)

BRONKHORST®

Page12RS232interface    9.17.027

3.3.3 RS232ASCIIprotocol



AnASCIIprotocolisusedontheexistingRS232‐HOST.TobecompatiblewithexistingdriversoftwaretheASCII

protocolisavailable.



AbasicdatalinkmessageiscodedinASCIIasfollows:



length node data 

: len1 len2 node1 node2 data1 data2 CR



Byte Explanation

: Initialcharacter(semicolon)

Len1,len2 Lengthofmessageincludingthenodeaddressinbytes,so(len1,len2)is

thebasicmessagelength+1.

node1,node2 nodeaddressofdestination(PCtoHOST)

nodeaddressofsource(HOSTtoPC)

data1,data2 messagefield

CR terminationcharacter



Allbytes(excepttheinitialandterminationcharacter)areconvertedfrom1binarybyteto2hexadecimalbytesin

ASCIIrepresentation.



Example:binarydatabyte0x2A‐‐>hexadecimalASCIIcharacters0x32,0x41.



AspecialmessagetypeisusedtopasserrormessagesfromtheHOSTtothePC.Itsstructure

isasfollows:



0x01 error

: 0x30 0x31 error1 error2 CR



Byte Explanation

: initialcharacter

0x30,0x31 lengthofthemessage(1byte)

error errorcode,twodigitHEXnumber

CR terminationcharacter



Theerrorcodecanhavethefollowingvalues:



Value Meaning

3 proparprotocolerror

4 proparprotocolerror(orCRCerror)

5 destinationnodeaddressrejected

9 responsemessagetimeout

1,2,8 generalerror



1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 41 42

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