Serial Port Component For Lazarus Pit Red Serial Connection To

Serial Port Component For Lazarus Pit Red Serial Connection To

I had my laptop talking to a motor controller over a RS232 serial connection to COM1, in a program I wrote.

Then I unplugged and moved everything to a different location.

Everything was 9600,8,N,1 which is the default for the motor controller.

Neither my own program or a serial communications program seems to do anything with the motor control.

The serial communications program still works normally with a precision thermometer that also communicates with those settings.

I can have it send data, and they scroll by on the laptop screen.

I have alternates for the motor controller and removed one from service to try it here, but there is still nothing.

If I put an AC voltmeter between pins 2 (Rx) and 5 (ground) on the PC end of the cable, I see a few volts AC when the motor controller is supposed to be transmitting, and I see about the same thing when I do this to the cable from the precision thermometer.

So, while pins 2 and 5 seem to have similar signals as seen by a voltmeter, the terminal program does not register if the source is the motor controller.

I have tried wiggling each component I can think of while data should be flowing from the motor controller to the laptop, but dont see anything.

I just verified the settings of 9600,8,N,1 for probably the 8th time on the terminal software, the thermometer, and both the motor drives I have available.

Theres no gibberish, no lights showing RX or TX changing state, nothing.

I dont have any serial diagnostic equipment but am going to go try to find an oscilloscope.