Eagle Tech 72A/C Bedienungsanleitung PDF herunterladen (Seite 22)

SERIAL Digital I/O Series User Manual Eagle Technology - Data Acquisition

Signal Definitions

This sections deal with all the signals abbreviations.

Table 3-8 Signal definitions

Pin Descriptions

Digital Inputs/Outputs (PA0-7, PB0-7, PC0-7)

These lines are connected to the 3 ports of the 8255 PPI. Each port can be configured as

either an input or an output.

Digital Ground (DGND)

All digital ground signals should be connected to this pin.

External Gate (GATE_EXT)

These lines are used to externally control the gate of the counters.

External Clock (CLK_EXT)

These lines are used to externally clock the counters.

Output (Out)

These are the outputs of each counter-timer.

Digital Ground (DGND)

All digital ground signals should be connected to this pin.

Analog Ground (AGND)

All analog inputs should be referenced to AGND. Do not connect AGND and DGND together.

This will create ground loops and instability in the hardware.

Analog Inputs (ACH0-15)

The analog input channels are connected to the analog input sub-system and are used to

measure analog voltages. These signals are referenced to analog ground (AGND).

Signal Description

PA0-7 8255 PPI Port A

PB0-7 8255 PPI Port B

PC0-7 8255 PPI Port C

GATE_EXT0-5 Counter External Gate

CLK_EXT0-5 Counter External Clock

OUT0-5 Counter Output

DGND Digital ground.

AGND Analog Ground

ACH0-15 Analog Input Channels 0 –15

TCH (0-)-(7-) Thermo couple negative input

TCH (0+)-(7+) Thermo couple positive input

DAC0-3 Analog Outputs Channels 0 – 3

EXT_CLK External Clock

EXT_TRIG External Trigger

10V_REFCAL 10 Volt Reference Calibration

RXD Receive

TXD Transmit

RXA Receive A

RXB Receive B

TXA Transmit A

TXB Transmit B

DGND Digital ground.

NC Not Connected

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 51 52

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