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sending hex protocols via mscomm to control a video projector

Posted on 2001-08-31
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Last Modified: 2012-05-04
i am currently trying to control a projector through rs232 using mscomm but i cannot get it to work the protocol command i am sending is "A5h 01h 01h 00h 01h 03h 00h 01h 00h 01h 17h 00h 80h 08h 00h 06h 40h54h 2Eh 00h 00h 00h A1h 5Ah"                 i know this is the right command as the projector comes with its own software for testing protocol commands on the projector.
this is what i have tried so far.

    MSComm1.CommPort = 1
    MSComm1.Settings = "38400,E,8,1"
    MSComm1.InputLen = 0    '
    MSComm1.PortOpen = True
    MSComm1.Output = "A5h 01h 01h 00h 01h 03h 00h 01h 00h 01h 17h 00h 80h 08h 00h 06h 40h54h 2Eh 00h 00h 00h A1h 5Ah"
i think the problem lies in that i am sending ASCI instead of the needed hex anyone have any ideas
thanks
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Question by:VMP
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7 Comments
 
LVL 6

Accepted Solution

by:
anthony_glenwright earned 400 total points
ID: 6447257
Instead of:

MSComm1.Output = "A5h 01h 01h 00h 01h 03h 00h 01h 00h 01h 17h 00h 80h 08h 00h 06h 40h54h 2Eh 00h
00h 00h A1h 5Ah"


Try something like:

strOutput = "&HA5 &H01 &H01 &H00 &H01 &H03 &H00 &H01 &H00 &H01 &H17 &H00 &H80 &H08 &H00 &H06 &H40 &H54 &H2E &H00
&H00 &H00 &HA1 &H5A"

For each vntItem in Split(strOutput, " ")
  MSComm1.Output = val(vntItem)
next
0
 

Author Comment

by:VMP
ID: 6447262
ill give that a try
thanks
0
 

Author Comment

by:VMP
ID: 6447267
ill give that a try
thanks
0
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LVL 12

Expert Comment

by:roverm
ID: 6447382
Here a nice example to address up to 4 comm ports without the use of MSCOMM :

http://www.thescarms.com/vbasic/CommIO.asp

D'Mzzl!
RoverM
0
 
LVL 49

Expert Comment

by:DanRollins
ID: 7205363
Hi VMP,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:

    Accept anthony_glenwright's comment(s) as an answer.

VMP, if you think your question was not answered at all or if you need help, just post a new comment here; Community Support will help you.  DO NOT accept this comment as an answer.

EXPERTS: If you disagree with that recommendation, please post an explanatory comment.
==========
DanRollins -- EE database cleanup volunteer
0
 
LVL 5

Expert Comment

by:Netminder
ID: 7240852
Per recommendation, force-accepted.

Netminder
CS Moderator
0
 

Expert Comment

by:hsctng
ID: 7827536
Hi,

If you want to send Hex through Comm Port, I think you should output the byte array for Output of MSComm.

Here is the VB code for your reference!!


Dim HexData(1) As Byte
HexData(0) = CInt(Val("&H" & "AA"))  ' Send &HAA
MSComm1.Output = HexData
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