Subject Re: Does dbase work with pole display From <rich@autotraker.com> <<rich@autotraker.com>> Date Tue, 8 Oct 2019 12:54:12 -0400 Newsgroups dbase.getting-started Been a long time for me too but looking at some code I have for a cash drawer I am setting display messages off. I think that prevented some erroneous error messages. serialComm1.displayMessages = false And sending a single character I had to repeat the same character multiple times. if len(SendString)=1     CashDrawerWidth = 10 // not sure where I got the number 10 from.     SendString = replicate(SendString,CashDrawerWidth) endif serialComm1.WriteString( SendString ) I see in my notes also that in the function writeString( Wstring ) There was a local statement that included Wstring and I had to remove that localizing of Wstring. That may be the reason for the Wstring.length throwing an error. also before sending the string you might want to make sure it is a string SendString = new string(""+SendString ) serialComm1.WriteString( SendString ) I may have an older version of SerialComm.cc since I never updated it since I stopped using it like over 10 years ago. Not sure this helps or that it even pertains to a pole display... Later on that company switched to a USB cash drawer because most machines don't have serial ports anymore and they also supplied me with a activeX. I also use another companies that came with a DLL for communications with the cash drawler. The same company also came out with a USB pole display with activeX. Might be worthwhile to look into a USB or DLL pole display instead of a serial port display. Rich... "Mervyn Bick"  wrote in message news:5JkZesafVHA.1876@ip-AC1E04A7... On 2019-10-08 12:12 AM, Emeka wrote: > Thank you Mervyn, > > When I clicked the Display text button, It displayed errot of 'variable > undefined' LENGTH in line 612 and 613 and 'variable undefined' SENDSTR in > line 616 of serialcomm.cc. Then when I click ignore severally, it will > display my text on the pole display meaning its opening the port. Please > how do I correct this error and continue. The good news is that your computer is at least talking to the pole display.  Now all it needs to do is to talk sense. :-) I'm afraid it's probably nearly 20 years since I last used serialComm.cc. My computer doesn't have a serial port so the little test form I posted previously was completely untested.  Even if I had a serial port installed it would be difficult to sort out problems as I don't have a similar pole display to play with. serialComm.cc may not accept single characters as a string so my attempt to send reset and cursorOff messages may be causing the problem.  On the other hand, I don't recall problems sending single commands to a modem but that was a long time ago.  Back in the days when I was working I also had access to a Data Analyser which was a great help in fixing problems. I suggest you start by replacing the pushbutton1_onClick() event handler with the following.     function PUSHBUTTON1_onClick()        oS = form.serialcomm1        oS.openPort('COM1',9600,'n',8,1)        oS.writeString(form.entryfield1.value)        oS.writeString(form.entryfield2.value)        oS.closePort() If this works type two new messages into the entryfields and see what happens when you click the pushbuttton. Mervyn.