I have set alls ports to “ignore” and my equipment works. No RED-LED! In a time of 1 to 10 Minutes the green LED-flickers sometimes. I close the connection after resetting errostatus. But simple 3-wire-connected (TX-RX-GND) devices may be disturbed!Īnd case 2 brings errors to nearly all devices! The device receives TX-datas and can not interpret or does not understand. Without DTR=high most intelligent instruments ignore TX-Datas. (more than 20 years)!Ĭase 3 normaly has no negative effect. These effects make many trouble since I work with serial equipments. I see in this moment on my tester: ( I made a video! )ġ: sporadic pulsing DTR high and going low againĢ: Rising DTR, sending some pulses on TX and afterwards DTR goes low againģ: Sporadic pulses on TX without rising any statuslines. It occurs on a normal “old” hardware-comm and even on “modern” USB-Serial-Ports! You can see it on every windows-machine with a simple LED-Tester. It is a fact, that windows sometimes sends pulses on TX and DTR even if no software using the port is running! I think the behavior occurs because windows or a driver is checking if new hardware is available.Īnd the maestro accepts and receives these pulses even when the statuslines are in off state. Windows or the driver does not activate the serial-statuslines! Only sends pulses on TX. My serial tester (hardware) show the sporadic datas on the TX-Line too when I replace the maestro with the tester. And suddenly without using my programm it goes to red error. Some minutes after the last command the red led stays off. In my new Excelmacro für controlling the Maestro I clear the errorstatus before each normal command. And we had a lot problems with measurmentmachines and euipment because of these “phantomdata” I had a lot to do with serial communication and measurement equipment in my job. With WIN 95/98/XP, WIN 7 and WIN 10 on many differnet computers and laptops. This behavior is known since Windows exist. periodically sends commands on all available ports. It is connected and connected to powerer. This erros occur even when I do not use the Maestro.
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