Subject Re: Does dbase work with pole display From Mervyn Bick <invalid@invalid.invald> Date Tue, 8 Oct 2019 09:36:37 +0200 Newsgroups dbase.getting-started 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.