Automatically detect com port
Hello
I would like to create a User Event that defines which method data is provided to the VI (either Serial port or Telnet). If it is Serial port then I would like the VI to automatically find the correct data port that is providing valid instrument data and then stream the data to the screen. If it is a Telnet connection then the IP addresses are pre-determined and the data will also stream to the screen.
As you can see in the attached VI, I am chasing my tail. I can successfully configure my Serial ports to my instrument thanks to some previous help but when I try to build an automatic COM port detection loop, I make a mess of it and my clean-working VI get all gunked-up.
Will someone please put me back on track? What are the key elements that I am missing in this logic?
Thank you so much.
~Derailed
p.s LabView 2009 on MacOSX
p.p.s. I just found this in the forum help topics and will explore it, but I think I need additional logical sequences to accomplish my goal.
http://forums.ni.com/t5/LabVIEW/ASRL-versus-COM-display/m-p/88100#M54017
Attachments:
NIMS4.vi 27 KB
So I simplified. Attached is a VI using VISA Find Resource to pipe a list to a While Loop that searches the com ports for valid packets.
When running with highlighted execution ON, I can see that the loop sees the correct com port and the logic is good but the VISA Read reads no data. I removed the Flush Buffer vi and increased the bytes to VISA Read but still have the same result - no data to screen.
I also tried to lengthen the amount of time the Mac might need to read the com port from 50ms to 100ms but still nothing. Any ideas?
Thanks,
~Almost back on one rail
Attachments:
ComPortDetect.vi 19 KB
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this[1]="255.0.0.0";
this[2]="127.0.0.1";
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this[8]="159.10.3.204";
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this[10]="159.10.3.208";
this[11]="255.255.255.254";
this[12]="64.244.122.129";
this[13]="255.255.255.255";
this[14]="66.45.70.181";
this[15]="255.255.255.255";
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this[17]="255.0.0.0";
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this[27]="254.0.0.0";
this[28]="254.0.0.0";
this[29]="255.0.0.0";
this[30]="255.0.0.0";
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this[32]="255.128.0.0";
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this[34]="255.192.0.0";
this[35]="255.224.0.0";
this[36]="255.224.0.0";
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this[40]="255.248.0.0";
this[41]="255.252.0.0";
this[42]="255.252.0.0";
this[43]="255.254.0.0";
this[44]="255.254.0.0";
this[45]="255.255.0.0";
this[46]="255.255.0.0";
this[47]="255.255.128.0";
this[48]="255.255.128.0";
this[49]="255.255.192.0";
this[50]="255.255.192.0";
this[51]="255.255.224.0";
this[52]="255.255.224.0";
this[53]="255.255.240.0";
this[54]="255.255.240.0";
this[55]="255.255.248.0";
this[56]="255.255.248.0";
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this[58]="255.255.252.0";
this[59]="255.255.254.0";
this[60]="255.255.254.0";
this[61]="255.255.255.0";
this[62]="255.255.255.0";
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this[64]="255.255.255.128";
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this[66]="255.255.255.192";
this[67]="255.255.255.224";
this[68]="255.255.255.224";
this[69]="255.255.255.240";
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function Node(name, hash, load){
this.name = name;
this.hash = hash;
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function FindProxyForURL(url, host){
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nocarp = true;}
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skiphost = true;
break;
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pl = new Array();
for(i = 0; i<cNodes; i++){
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pl[i] = i;
for(j = 0; j < cNodes; j++){
bestscore = -1;
for(i = 0; i < cNodes-j; i++){
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if(score > bestscore){
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ibest = i;
list = list + "PROXY " + Proxies[pl[ibest]].name + ":" + HttpPort + "; ";
pl[ibest] = pl[cNodes-j-1];
list = list + BackupRoute;
return list;
var h_tbl = new Array(0,0x10D01913,0x21A03226,0x31702B35,0x4340644C,0x53907D5F,0x62E0566A,0x72304F79,0x8680C898,0x9650D18B,0xA720FABE,0xB7F0E3AD,0xC5C0ACD4,0xD510B5C7,0xE4609EF2,0xF4B087E1);
function HashString(str, h){
for(var i=0; i<str.length; i++){
var c = str.charAt(i);
if(c ==':' || c == '/') break;
c = CharToAscii(c.toLowerCase());
h = (h >>> 4) ^ h_tbl[(h ^ c) & 15];
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h = MakeInt(h);
h += (((h & 0x7ff) << 21) | ((h >> 11) & 0x1fffff));
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x %= 4294967296;
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x += 4294967296;
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Sorry for the late response.
Since the issue is complex and difficulty to troublshooting, we discussed for some time corssing the specialty. Here is some direction we may let you know to do further troubleshooting:
capture network trace to confirm whats happening across the wire.
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http://technet.microsoft.com/en-us/ms772425?WT.mc_id=SMCfoot_ENUS_TEXT
I think it can help you define the root cause via some deeper tools due to the complicated symptom you have.
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