semi-OT: text lites

On Wednesday 28 April 2004 19:14, John Allain wrote: Step 1. Grab DMM/VOM. It's much easier to check voltages with (assuming the serial port is normally inactive). Step 2. Either tip or ring will be your output. A cable like a 1/8" (mini) to dual RCA "splitter" cable should give you those on the RCA connector centers. Check center to ground on both if you get 10-15V on one, you've got RS-232, and it's your output. If you get about 5V, it's TTL, and your output. If you get < 1V, it's probably the input, but could be a TTL output. If both lines give you <1V, stick your DMM/VOM into resistance mode, and check resistance between the lines with the device on. This is safer with a DMM as it'll use a lower voltage to test with. The line with the lower resistance is the output (probably 1kohm or less); the line with the higher resistance is the input ( probably >=10kohm). In any case, it's TTL not RS/232 if you don't measure +-/- 10-15V. Make sure you check both connectors to be sure. Pat -- Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/ The Computer Refuge --- http://computer-refuge.org