P
Peter Andersen
- Jan 1, 1970
- 0
Hi,
I am trying to capture an input with a status pin on the standard IBM
parallel port.
I looks like all the status pins are set high default when there's no
external voltage source connected.
If I measure the voltage drop across pin 13 (status 4) and pin 25 (ground) I
get 5,1 V. Shouldn't it be zero?
I am using FreeBSD and if I read the value of the status pins with nothing
connected I get
Status: 0x7f
Nothing happens if I connect a 5 V voltage source to pin 13 and pin 25.
If I short circuit pin 13 and pin 25 I get
Status: 0x6f
Isn't it supposed to be the other way around or am I doing something wrong?
Best regards.
I am trying to capture an input with a status pin on the standard IBM
parallel port.
I looks like all the status pins are set high default when there's no
external voltage source connected.
If I measure the voltage drop across pin 13 (status 4) and pin 25 (ground) I
get 5,1 V. Shouldn't it be zero?
I am using FreeBSD and if I read the value of the status pins with nothing
connected I get
Status: 0x7f
Nothing happens if I connect a 5 V voltage source to pin 13 and pin 25.
If I short circuit pin 13 and pin 25 I get
Status: 0x6f
Isn't it supposed to be the other way around or am I doing something wrong?
Best regards.