National Instruments SCXI-1355 User manual

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321538A-01 © Copyright 1997 National Instruments Corp. All rights reserved. April 1997
SCXI-1355 SHIELDED CABLE
This guide describes how to install the SCXI-1355 shielded cable with an
adapter board between an SCXI module and a DAQDIO 6533
(DIO-32HS) Series data acquisition (DAQ) board.
Introduction
With the SCXI-1355 shielded cable, you can make a low-noise,
long-distance connection between your SCXI chassis and your
DAQDIO 6533 Series board. You can use the SCXI-1355 with the
DAQDIO 6533 Series AT-DIO-32HS and PCI-DIO-32HS boards.
The SCXI-1355 shielded cable consists of a 1, 2, or 5 m round cable that
has a 68-pin female connector at each end. When plugged into the
SCXI-1355 adapter board, the shielded cable brings the pinout of the
DIO board I/O connector to the SCXI module and to a breakout
connector you can use with other SCXI accessories, such as the
SCXI-1180 and the SCXI-1351.
What You Need to Get Started
To set up and use your SCXI-1355 cable, you need the following items:
❑ SCXI-1355 kit
Cable adapter board
1, 2, or 5 m SH68-68-D1 cable
Two small screws
Two cable tie wraps
SCXI-1355 Shielded Cable Installation Guide
❑ SCXI chassis
❑ SCXI module

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❑ DAQDIO 6533 Series AT-DIO-32HS or PCI-DIO-32HS board with
a 68-pin SCSI type II connector
❑ Small Phillips-head screwdriver
❑ Small flathead screwdriver
❑ Your computer
Installation
Figure 1 shows the components of your SCXI system and how to connect
them.
SCXI Module
Adapter
Board
Step 4 Step 5
Step 6
Shielded Cable
Step 7
DAQDIO 6533
Board
Figure 1. SCXI System Components
Perform the following steps to install the SCXI-1355 cable:
1. Turn off the power to your computer and the SCXI chassis.
2. Install your SCXI modules in the SCXI chassis, following the
instructions in your SCXI module user manuals.
3. Set the adapter board switch for parallel mode (P) or serial mode (S).
See Figure 2, which also shows the circuit on the DIOA(0) line, for
each switch setting.
Use the adapter board, the SCXI module, and DAQDIO 6533 Series
board in parallel mode when you want each DIO line to be directly
conditioned by an SCXI module channel to which you cable.
Use the system in serial mode when you want to use the
DAQDIO 6533 Series board as a communication device to control
one or more SCXI modules in the chassis. Check your SCXI module

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user manual to make sure that your module supports the mode you
want to use and that you have properly configured the necessary
jumpers on your SCXI module.
+5 V +5 V
100 kΩ100 kΩDIOA(0)
of Module
Connector
DIOA(0)
of Module
Connector
DIOA(0)
of Breakout and
DAQDIO 6533
Connector
DIOA(0)
of Breakout and
DAQDIO 6533
Connector
P
SW1
S
P
SW1
S
a. Parallel Mode Setting
(Factory Default) b. Serial Mode Setting
Figure 2. SCXI-1355 Adapter Board Switch SW1 Settings
4. Plug the socket connector of the SCXI-1355 adapter board into the
rear signal connector of an SCXI module.
5. Secure the SCXI-1355 adapter board by screwing the two small
screws through the rear panel of the adapter board and into the
threaded strips in the back of the SCXI chassis.
6. Connect one end of the SCXI-1355 cable to the 68-pin connector of
the SCXI-1355 adapter board.
7. Connect the other end of the cable to the I/O connector of the
DAQDIO 6533 Series board.
8. Secure the cable to a fixed object with the tie wraps to relieve the
strain on the cable. Strain relief is necessary because the SCXI-1355
shielded cable has a long, stiff backshell that can exert leverage on
the DAQDIO 6533 Series board connector.

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Figure 3 shows the completed installation.
Computer
SCXI-1355
Shielded Cable
SCXI
Chassis
Figure 3. Completed SCXI-1355 Shielded Cable Installation

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Pin Assignments
Table 1 lists the pin assignments for the adapter board connectors.
Table 1. Pin Assignments
DAQDIO 6533
Signal Name DAQDIO 6533 Pin Breakout Connector Pin1
SCXI Module
Connector Pin2
GND 11, 14, 18, 20, 24, 27, 30, 33,
36, 37, 39, 41, 42, 46, 49, 50,
55, 59, 62, 65, 68
17, 19, 21, 23, 25, 26, 28, 30,
32, 34 50
RGND319, 35, 43, 56 17, 19, 21, 23, 25, 26, 28, 30,
32, 34 50
+5 V 1 Not connected 49
DIOA(0)410 37 47
DIOA(1) 44 39 45
DIOA(2) 45 38 43
DIOA(3) 12 40 41
DIOA(4) 13 35 39
DIOA(5) 47 42 37
DIOA(6) 48 36 35
DIOA(7) 15 41 33
DIOB(0) 16 47 31
DIOB(1) 17 50 29
DIOB(2) 51 44 27
DIOB(3) 52 48 25
DIOB(4) 53 49 23
DIOB(5) 54 43 21
DIOB(6) 21 46 19
DIOB(7) 22 45 17
DIOC(0) 23 14 15
DIOC(1) 57 12 13
DIOC(2) 58 13 11
DIOC(3) 25 11 9
DIOC(4) 26 16 7
DIOC(5) 60 9 5

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Table 1. Pin Assignments (Continued)
DAQDIO 6533
Signal Name DAQDIO 6533 Pin Breakout Connector Pin1
SCXI Module
Connector Pin2
DIOC(6) 61 15 3
DIOC(7) 28 10 1
DIOD(0) 29 4 48
DIOD(1) 63 1 46
DIOD(2) 64 7 44
DIOD(3) 31 3 42
DIOD(4) 32 2 40
DIOD(5) 66 8 38
DIOD(6) 67 5 36
DIOD(7) 34 6 34
REQ1 2 33 24
ACK1 3 27 18
STOPTRIG1 4 29 20
PCLK1 5 31 22
REQ2 9 24 32
ACK2 8 18 26
STOPTRIG2 7 20 28
PCLK2 6 22 30
CPULL 40 Not connected 14
DPULL538 Not connected 16
Notes:
1. This is the same pinout as DIO-32F boards from National Instruments.
2. Pins 2, 4, 6, 8, 10, and 12 on the SCXI module connector are not connected.
3. RGND pins are connected to GND pins on the DAQDIO 6533 and on the adapter board. However, the shielded cable
does not connect these four pins from the DAQDIO 6533 to the adapter.
4. DIOA(0) on the SCXI module connector is tied to +5 V with a 100 kΩresistor on the adapter board. This pin
connects directly to DIOA(0) of the breakout and DAQDIO 6533 connectors when you set SW1 for parallel mode.
When you set SW1 for serial mode, the adapter board inserts a buffer to redrive the module connector pin to the
breakout connector and DAQDIO 6533 connector.
5. DPULL is tied to +5 V with a 470 Ωresistor on the adapter board.