Multiple Module Scanning - Handshaking

Refer to the trigger topic of the switch module in Devices for possible Trigger Input locations.

PXI Options

• Setup 3—Using Internal PXI Trigger Lines
• Setup 4—Using AUX Trigger Cable Connected to Front of PXI Switch

SCXI Options

• Setup 8—Using SH9MD-AUX Cable
• Setup 9—Using AUX Trigger Cable Connected to the Front of the SCXI Switch
• Setup 10—Using Internal PXI/SCXI Trigger lines

PXI

Setup 3—Using Internal PXI Trigger Lines

To handshake with multiple PXI switches, you can use internal PXI trigger lines. In this setup, a trigger cable is not needed between the DMM and the PXI switches.

1. Open niSwitch Multi Switch Hand Int.
2. Create scan lists according to the process described in Multiple Module Scan Lists.
3. Set Trigger Input to the same PXI trigger line for all switches. This input line should coincide with the destination of the DMM MC signal.
4. Set Scan Advanced Output to the same PXI trigger line for all switches. This output must coincide with the trigger source of the DMM.

Setup 4—Using AUX Trigger Cable Connected to Front of PXI Switch

Some PXI switches can receive/send triggers from/to the front panel or terminal block. This setup uses the AUX trigger cable to trigger the switches.

1. Connect the MC signal from the DMM to the external trigger input terminal on the front panel or in the terminal block of one PXI switch.
2. Connect the Ext Trig In signal of the DMM to the Scanner Advanced terminal on the front panel or in the terminal block of the same PXI switch.
3. Open niSwitch Multi Switch Hand Ext.
4. Create scan lists according to the process described in Multiple Module Scan Lists.
5. Add niSwitch Route Trigger Input and niSwitch Route Scan Advanced Output before niSwitch Commit of the switch where the AUX trigger cable from the DMM is connected.
6. Set Trigger Input Connector to Front Connector.
7. Set Scan Advanced Output Connector to Front Connector.
8. Set Trigger Input Bus Line to a PXI trigger line.
9. Set Trigger Input of all the switches to the same PXI trigger line of Trigger Input Bus Line.
10. Set Scan Advanced Output Bus Line to a different PXI trigger line.
11. Set Scan Advanced Output of all the switches to the same PXI trigger line of Scan Advanced Output Bus Line.
12. Set Measurement Complete Destination to External in the DMM configuration.
13. Set Trigger Source to External in the DMM configuration.

SCXI

Setup 8—Using SH9MD-AUX Cable

This setup uses an SH9MD-AUX cable between the NI 407x and the SCXI high-voltage analog bus connected to a switch in an SCXI-1000, SCXI-1001 or PXI-1010, or to the back of a PXI-1011. Refer to the SCXI Backplane Adapters in Controlling and Triggering Switches for more information.

Note  Only the NI 407x can be used in this setup. NI-DMM 2.2 or later is required.

1. Open niSwitch Multi Switch Hand Ext.

   Note  This program cannot be used with the NI SCXI-1127/1128/1129. These modules cannot send a scanner advanced signal to the rear connector.

2. Create scan lists according to the process described in Multiple Module Scan Lists.
3. Connect one end of the SH9MD-AUX cable to the 9-pin DIN connector on the front of the NI 407x.
4. Connect the other end of the SH9MD-AUX cable to the 9-pin DIN connector labeled AUX IN on the SCXI high-voltage analog bus.
5. Add niSwitch Route Trigger Input and niSwitch Route Scan Advanced Output before the niSwitch Commit of the switch where the SH9MD-AUX cable is connected. Refer to the SCXI Backplane Adapters section to determine which module is connected to the SH9MD-AUX cable.
6. Set Trigger Input Connector to Rear Connector.
7. Set Scan Advanced Output Connector to Rear Connector.
8. Set Trigger Input Bus Line to TTL0.
9. Set Trigger Input to TTL0 for all switches.
10. Set Scan Advanced Output Bus Line to TTL1.
11. Set Scan Advanced Output to TTL1 for all switches.
12. Set Measurement Complete Destination to External in the DMM configuration.
13. Set Trigger Source to Aux Trig 1 in the DMM configuration.

Setup 9—Using AUX Trigger Cable Connected to the Front of the SCXI Switch

SCXI switches can receive/send triggers from/to the front panel or terminal block. This setup uses an AUX trigger cable between the DMM and the front panel or in the terminal block of an SCXI switch. The switch is controlled by another device.

1. Connect AUX trigger cable to the 9-pin DIN connector on the front of the DMM.
2. Connect the MC cable of the AUX trigger cable to the external trigger input terminal (ext trig in) on the front panel or in the terminal block of one SCXI switch.
3. Connect the EXT TRIG IN cable of the AUX trigger cable to the scanner advanced terminal on the front panel or terminal of the same switch.
4. Open niSwitch Multi Switch Hand Ext.

   Note  This program cannot be used with the NI SCXI-1127 or the NI SCXI-1128.

5. Create scan lists according to the process described in Multiple Module Scan Lists.
6. Add niSwitch Route Trigger Input and niSwitch Route Scan Advanced Output before the niSwitch Commit of the switch where the AUX trigger cable is connected.
7. Set Trigger Input Connector to Front Connector.
8. Set Scan Advanced Output Connector to Front Connector.
9. Set Trigger Input Bus Line to TTL0.
10. Set Trigger Input to TTL0 for all switches.
11. Set Scan Advanced Output Bus Line to TTL1.
12. Set Scan Advanced Output to TTL1 for all switches.
13. Set Measurement Complete Destination to External in the DMM configuration.
14. Set Trigger Source to External in the DMM configuration.

Setup 10—Using Internal PXI/SCXI Trigger Lines

This setup uses the internal trigger lines of a PXI/SCXI combination chassis to trigger the SCXI switches. In this setup, no trigger cable is used between the NI PXI-407x and the SCXI switch.

Note  Only the NI PXI-407x can be used in this setup. NI-DMM 2.2 or later is required.

1. Install the NI PXI-407x in the rightmost PXI slot.
2. Open niSwitch Multi Switch Hand Int.

   Note  This program cannot be used with the NI SCXI-1127 or the NI SCXI-1128.

3. Create scan lists according to the process described in Multiple Module Scan Lists.
4. Set Trigger Input to TTL0 for all switches.
5. Set Scan Advanced Output to TTL1 for all switches.
6. Set Measurement Complete Destination to LBR Trig 0 in the DMM configuration.
7. Set Trigger Source to LBR Trig 1 in the DMM configuration.