DAQ VXI-SC-1102 Bedienerhandbuch PDF herunterladen (Seite 61)

Chapter 10 DIO-32F and 6533 Digital I/O Devices

DAQ Hardware Overview Guide 10-2 www.ni.com

and ACK2 as extra outputs, in which case they functions as OUT1 through

OUT4 lines. Refer to your hardware user manual for the locations of these

lines on the I/O connector.

You can configure ports 0 through 3 for both handshaking and

no-handshaking modes. To configure the ports for handshaking mode, you

must assign the ports to one of two handshaking groups. The digital

I/O connector has handshaking lines for the groups. These handshaking

lines include the REQ1 and REQ2 lines for request, and the ACK1 and

ACK2 lines for acknowledge. The 6533 also has STOPTRIG1 and

STOPTRIG2 for stop triggers, and PCLK1 and PCLK2 lines for clocks.

Signals received or generated on the handshaking lines affect only the ports

assigned to the group.

Port 4 is always configured as an I/O port. Writing to port 4 affects the extra

output lines. Reading from port 4 returns the digital values of the extra input

lines. Table 10-1 shows the lines that are mapped to the bits within the byte

written to or read from port 4.

On a 6533, when group 1 is configured for handshaking, you cannot use the

group 1 handshaking lines as extra inputs or outputs. In this case, port 4

output operations have no effect on the ACK1 (OUT1) and PCLK1 (OUT3)

lines. Port 4 input operations do not return valid data bits for the REQ1

(IN1) and STOPTRIG1 (IN3) lines. Similarly, when group 2 is configured

for handshaking, you cannot use the group 2 handshaking lines as extra

inputs or outputs.

Table 10-1. DIO-32F Extra Inputs and Outputs

Bit

Number

DIO-32F Line Used

Input Operation

DIO-32F Line Used

Output Operation

Restrictions

7 to 2 None None None

1 IN2 OUT2 None

0 IN1 OUT1 None

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 150 151

Keine Kommentare

DAQ VXI-SC-1102 Bedienerhandbuch Seite 61