How to test the communication stability and calculate ber using the CVI ?

Our chief engineer gave me a task yeasterday.He asked me to do software testing and calculate bit error rate that we would know our communication stability.
However,I have never touched this aspect of knowledge. I have known a bit about CVI and I want to write bit error rate code using CVI.Thus,I could test the communication stability.
But I don't know how to analyse and judge the receiving codes whether they are right or wrong.
We use Modbus communication protocol and receive data via serial port,so I want to save all datas and record the total datas number ,marking as M.
then,save the eligible datas and record the mumber marking as N. So, bit error rate is (M-N)/M .
Whether this is feasible ? Or you have any good idea. Thank you very much.
unsigned char in_data[100];
inqlen = GetInQLen (comport);
for(i=0;i<inqlen;i++)
in_data[i]=ComRdByte(comport);
Above is my code that receive all datas and I want to save the array in_data[] data and record the number.
switch(inqlen)
case 19:
crc=usMBCRC16(in_data,inqlen );
if((in_data[1] == 0x03)&&(crc==0)&&(in_data[0]==device_addr))
Above is the condition judgement that receive eligible datas which number marks as N.
I know there is a precondition that I filter out all the wrong data . However ,I don't know any good idea. I will appreciate if anyone could help me.
Thank you very much.
Best regards.
xiepei
I wouldn't care success or failure,for I will only struggle ahead as long as I have been destined to the distance.
Solved!
Go to Solution.

Hi xiepei,
since you are using modbus, a simple error checking is implicit in the protocol and is the comparison between returned checksum and the calculated one on the received message: checksum errors, if any, are an effect of communications errors (you should have at least 2 bits changed and on particular patterns to have the checksum be calculated correctly!). You won't be able to calculate BER on them, but you can calculate PER (Packet Error Rate).
Another flag for communication errors, on the other direction, is to intercept error messages from the device: if it fully implements modbus protocol, it should return some warning in case of error (I seem to remember that in some cases it returns the reveived message with some error bits added: please check in modbus documentation).
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Hi xiepei,
since you are using modbus, a simple error checking is implicit in the protocol and is the comparison between returned checksum and the calculated one on the received message: checksum errors, if any, are an effect of communications errors (you should have at least 2 bits changed and on particular patterns to have the checksum be calculated correctly!). You won't be able to calculate BER on them, but you can calculate PER (Packet Error Rate).
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