Manual ME-5001
Rev. 1.1E
Meilhaus Electronic
Page 19
Hardware
Diagram 5: Wiring the frequency inputs/outputs
The specifications for the digital I/O ports apply to the wiring of the
FI/FO lines. A reference to the PC ground (PC_GND) must always be
established. The maximum output current is I
Out
= I
OL
= I
OH
= 24 mA.
The frequency counters and pulse generators are configured by software.
Please read chapter 4.2 on page 27 for programming the frequency in-
put/output.
3.5
External Interrupt
If required, you can also monitor the bit-pattern of the digital inputs.
The "bit-pattern change" mode is available on the ME-5001. 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 operation
mode. The interrupt handling is carried out with the
meIOIrq…
func-
tions; see also chapter 4.2 on page 27.
3.6
Additional Functions
You can make the following settings for adapting to your application
regardless of the operating mode.
FI_
x
GND_PC
TTL level
"Frequency measurement inputs"
FO_
x
GND_PC
TTL level
"Pulse generator output"
R
L
I
Out
= 24mA
