"Check your USB-Serial cable first. That's the USB cable with a DB-9 male RS232 connector. Plugged to the PC. No cables connected to it.
Type in TeraTerm. Question: Do you see any characters? If so, you have echo on. If not, echo is off. Go into TeraTerm settings and turn echo on, and try again until you see the characters you type." OK - only the usb/serial cable, plugged into usb port of laptop. No characters appear. Change TeraTerm Terminal (VT100) to Echo. Characters appear. Next step: "Short pin 2 to pin 3 on the DB-9. Type in TeraTerm. If you see only see one character per keypress, the adapter fails the test. If you see 2 characters per test (one for the echo, and one transiting the cable) then it passes the test." I shorted 2 and 3 on the DB9 end of the usb/serial cable, while cable is still plugged into usb port. I typed one character. One character appeared on laptop screen. Seems strange the 2 - 3 shunt on the 102 pins would fail loopback test *and* the 2 - 3 shunt on the cable fails the test on the laptop also. Tom M. On Fri, Apr 5, 2019 at 5:07 PM John R. Hogerhuis <[email protected]> wrote: > > > On Fri, Apr 5, 2019 at 1:55 PM Thomas Morehouse <[email protected]> > wrote: > > Reduce variables. > > Check your USB-Serial cable first. That's the USB cable with a DB-9 male > RS232 connector. Plugged to the PC. No cables connected to it. > > Type in TeraTerm. Question: Do you see any characters? If so, you have > echo on. If not, echo is off. Go into TeraTerm settings and turn echo on, > and try again until you see the characters you type. > > Short pin 2 to pin 3 on the DB-9. > > Type in TeraTerm. > > If you see only see one character per keypress, the adapter fails the > test. If you see 2 characters per test (one for the echo, and one > transiting the cable) then it passes the test. > > -- John. >
