DAQ VXI-SC-1102 Manual de Instruções descarregar pdf (Página 39)

Chapter 3 LPM Devices

National Instruments Corporation 3-3 DAQ Hardware Overview Guide

LPM Device Data Acquisition Rates

Table 3-1 shows the maximum recommended data acquisition rates.

LPM Device Digital I/O

The LPM devices contain one 8-bit digital input port and one 8-bit digital

output port. The digital I/O ports are labeled DIN and DOUT on the

I/O connector, as shown in your device user manual. The ports are referred

to as ports 0 and 1 for the Digital I/O functions, in which:

• DOUT = port 0

• DIN = port 1

You can program ports 0 and 1 for no-handshaking mode only. You can use

port 0 for no-handshaking digital output mode. You can use port 1 for

no-handshaking digital input mode.

LPM Device Interval Counter/Timer Operation

The LPM device interval counter/timer operation is the same as for the

Lab-PC+, except that the LPM devices have a single counter. Refer to the

Lab and 1200 Devices Interval Counter/Timer Operation section in

Chapter 2, Lab and 1200 Devices, for detailed information.

Table 3-1.

Maximum Recommended Data Acquisition Rates for the LPM Devices

Sample Mode

Maximum

Acquisition Rate

(kS/s)

Sample

Interval

(µs)

Single-channel scan 50 20

Multiple-channel scan

(0 to +5 V, −2.5 to +2.5 V,

and −5 to +5 V input ranges)

50 20

Multiple-channel scan

(0 to 10 V input range)

50 (typical)

45 (worst case)

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 150 151

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DAQ VXI-SC-1102 Manual de Instruções Página 39