The specifications of the digital-I/O ports also apply to the FI/FO
lines. For all inputs and outputs a reference to the ground of exter-
nal wiring has to be setup in any case. For the frequency measure-
ment inputs this is the ground of the digital input section (GND_DI,
pin 15) and for the pulse generator outputs this is the ground of
the digital output section (GND_DO, pin 21).
The frequency counters and pulse generators are configured via
software. Chapter 4.1.2 on page 23 describes the programming of
the frequency I/Os.
3.5 External Interrupt
If required, you can also monitor the bit-pattern of a digital input
port. You can select one of the modes “bit-pattern change” and
“Bit-pattern compare”. As soon as the specified event occurs, an
interrupt is issued and passed directly to the PC.
The digital inputs/outputs are programmed in the single operating
mode. The interrupt handling is carried out with the
func-
tions; see also chapter 4.2 on page 25.
Summary of Contents for ME-5004
Page 12: ......
