According to the standard specifications for RS-232, an output must generate a voltage level of +5 to +15 VDC (logic "low"),
and -5 to -15 VDC (logic "high") into a load of 3 to 7 kΩ. An RS-232 receiver must present a 3 to 7 kΩ load , converting an input of +3 to +25 VDC to logic "low", and an input of +3
to +25 VDC to logic "high". With a positive trigger pulse, the offset voltage does not have any significance. Even small variations (flutter) over and
below 0 VDC will not trigger the interface.
|
B |
Connection on remote device |
|
C |
Female 9-pin D-Subminiature connector |
|
D |
Male 9-pin D-Subminiature connector |
NoteRS-422 communication ports can not be used for synchronization purposes. The port you wish to use must be set to RS-232.