forum.vdsworld.com

[DanTheMan]

Hi !,
I’m working on a serial communication (comport) project to send/receive data from/to a POS Customer Display. I’m using Tommys vdsserio Dll. So far everyting works fine!, but right now I’ve run into a problem!?!.

I need to check the hardware flow control (this device cannot use the xon/xoff control). So I need to Check/Set the comport status signals RTS/CTS, cause I have to
now if the device is busy or not.

My question: Do anyone knows howto do this within VDS, ?, vdsserio works fine with sending/receiving data but I think it's impossible to check the comport status from another program thus the port is hooked from the vdsserio dll.

Please help ?

// Dan

[Tommy]

Dan,

Sorry that I didn't reply before. The DLL contains an undocumented FLOWCONTROL command:

DLL SERIAL, FLOWCONTROL, XONOFF, <hexadecimal value of XON character>, <hexadecimal value of XOFF character>, <XON limit number>, <XOFF limit number>

DLL SERIAL, FLOWCONTROL, RTSCTS

DLL SERIAL, FLOWCONTROL, DTRDSR

I'm not sure though if these commands will make it work as if or that additional commands
should be added in in order to make the flow control methods useful.

Tommy

[DanTheMan]

Thank's Tommy i'll tried the undocumented FLOWCONTROL but with no
luck ?. The serial,send command seemes to ignore this. But Thank's anyway.

PS. Do you have more info about the Delphi comm. part you used for this dll ?

Dan

[Tommy]

I used the "Delphree - AsyncFree" components. I tried to use the communication port
API calls directly myself a while ago but it wouldn't work perfectly for some reason, so I just
used to components to be sure it would work well.

http://delphree.clexpert.com/pages/projects/asyncfree/default.htm

[kc7aad]

Anyone know where I can find the vdsserio Dll from Tommy??

Been looking for it, and hoping it will work in VDS5.




Thanks for any help!!

[DaveR]