So that means that while the HAL-340 is outside the RS232 specs, the MAX3221 should still be able to use the signal as the MAX232 does. For other Windows applications, virtual ports will be seen exactly as two real serial ports connected via null-modem. Interestingly, from a quick check at the datasheet from the MAX232 and MAX3221 chips that are on the V3.x and Microsquirt, respectively, they both show that 0V should be an acceptable value since the low level threshold is above 1V even though that's outside the RS232 specs. Gigaware Usb Serial Driver Software Virtual Serial Port Driver XP v.4.5 Virtual Serial Ports Driver XP creates two pure virtual serial ports in your system which are virtually connected to each other. I should have checked the actual voltage range then. When I had the issues I mentioned previously, I did scope the RS232 side but did not actually check the levels but rather only the presence of a signal. So it seems that the MAX232 is unexpectedly accepting an out of spec signal.īy contrast my working USB-serial adapter (Prolific chipset from Maplin) puts out around +7V/-7V. That's wrong!!! The RS232 specs are a minimum of +3V/-3V and up to +15V/-15V.

The adapter was sending a +5V/0V signal to the ECU. I got around to testing this on the scope the other day and found what was wrong. I have here a 'HAL-340' no-name USB-serial adapter that works fine with traditional Megasquirt (V3.0 or V3.57 mainboard) but will not work with Microsquirt or MS3-Pro.

Bridge controller driver gigaware agp8x asus t2 agp8x gigaware usb 2.Jsmcortina wrote:For info.Connecting scanners via usb from the radioreference wiki with the lack of serial ports on newer pcs these days, having to connect to a usb port is a necessary, but sometimes frustrating, evil.Application areas include usb rs232, usb serial, usb parallel, usb docking stations, and upgrades of legacy designs to usb.

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