National Instruments BNC-2110 User manual

Product and company names are trademarks or trade names of their respective companies.
321860B-01
©
Copyright 1998 National Instruments Corp. All rights reserved. June 1998
INSTALLATION GUIDE
BNC-2110 DESKTOP AND DIN RAIL-MOUNTABLE
BNC ADAPTER
This installation guide describes how to install and configure your
BNC-2110 accessory.
Introduction
The BNC-2110 is a desktop and DIN rail-mountable BNC adapter you
can connect directly to data acquisition (DAQ) devices. The BNC-2110
includes 15 BNC connectors and a digital screw terminal with 30 pins.
The BNC-2110 has a 68-pin I/O connector that connects to the PCI-60XXE
and PCI-61XXE DAQ devices. The BNC-2110 is ideal for simplifying
connections between your measurement apparatus and your DAQ device
in laboratory, test, and production environments.
What You Need to Get Started
To set up and use your BNC-2110 accessory, you will need the following:
❑BNC-2110 BNC Adapter
❑BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter
Installation Guide
❑PCI-60XXE or PCI-61XXE device and the appropriate cable
Detailed specifications for the BNC-2110 are in the Specifications section
later in this guide.

BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter 2 © National Instruments Corporation
Configuring Your BNC-2110
This section describes how to configure your BNC-2110 accessory.
Figure 1 shows the front panel of the BNC-2110.
Figure 1. BNC-2110 Front Panel
1 Floating Source (FS)/Ground-Reference Source
(GS) Switch
2 BNC Connectors
3 Digital Screw Terminals
2
1
3

© National Instruments Corporation 3 BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter
Table 1 describes the BNC connectors available on the front panel of your
BNC-2110.
Connecting Analog Inputs
You can use the BNC-2110 to measure floating and ground-referenced
analog input signals. To measure floating signal sources, move switches
ACH0 through ACH7, located below the BNC connectors, to the floating
source switch position (labeled FS). In the floating source switch position,
the amplifier negative terminal is connected to ground via a 100 Ωresistor.
Table 2 shows the BNC-2110 switch configuration options.
Table 1. BNC-2110 Connector Signal Descriptions
Front Panel BNC
Connectors Signal Description
ACH<0..7> Differential Analog Channels 0 through 7
DAC0OUT Digital to Analog Converter 0 Output—This
pin supplies the voltage output of analog
output channel 0.
DAC1OUT Digital to Analog Converter 1 Output—This
pin supplies the voltage output of analog
output channel 1.
EXTREF External Reference—This is the external
reference input for analog output circuitry.
PFI0/TRIG1 Programmable Function
Input 0/Trigger 1—As an input, this is either
one of the PFIs or the source for the
hardware analog trigger.
CTR0OUT Counter 0 Output—This is the output from
the General-Purpose Counter 0 Output.
USER1 User-Defined 1—Connected to USER1
digital screw terminal block. This connector
allows you to modify a signal depending on
your application.
USER2 User-Defined 2—Connected to USER2
digital screw terminal block. This connector
allows you to modify a signal depending on
your application.

BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter 4 © National Instruments Corporation
To measure ground-referenced signals, move the switches to either
the floating or ground-referenced source position. However, for best
performance, use the ground-referenced source position (labeled GS) to
avoid ground loops. Refer to your DAQ device user manual for more
information on measuring floating and ground-referenced signals.
Connecting Analog Outputs
The BNC-2110 connects to the analog output channels on the PCI-60XXE
and PCI-61XXE devices with the DAC0OUT and DAC1OUT BNC
connectors.
Connecting Digital I/O Signals
Use both the screw terminal plugs and the BNC connectors to connect
your digital signals to your DAQ device. Refer to Table 4 to make these
connections. When connecting signals to the screw terminal plugs, you
can use up to 24 AWG wire with the insulation stripped to 0.28 in. Refer
to Tables 1 and 3 for the signal names of all the labeled connectors.
Table 2. Configuration Summary
BNC-2110 Switch
Configuration
Signal Source Types
Floating Source Ground-Referenced Source
Floating Source
(FS)
Ground-
Referenced Source
(GS)
+
–
Signal
Source BNC-2110
DAQ Device
(Differential Input
Mode)
AIGND
+
–
Recommended
+
–
Signal
Source BNC-2110
DAQ Device
(Differential Input
Mode)
AIGND
+
–
Not Recommended
+
–
Signal
Source BNC-2110
Improper Configuration
DAQ Device
(Differential Input
Mode)
+
–+
–
Signal
Source BNC-2110
DAQ Device
(Differential Input
Mode)
AIGND
+
–
Recommended

© National Instruments Corporation 5 BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter
Two user-defined BNC connectors, USER1 and USER2, are connected
to the screw terminal blocks on the BNC-2110 front panel. These screw
terminals and their associated BNC connectors give you the flexibility
to choose up to two additional digital/timing signals. For example, if an
application requires access to SCANCLK and CTR1OUT signals, you can
wire the screw terminals labeled SCANCLK and CTR1OUT to the screw
terminals labeled USER1 and USER2, respectively. This configures BNC
connector USER1 as SCANCLK and USER2 as CTR1OUT.
All of the digital and timing signals from the PCI-60XXE and PCI-61XXE
devices are available on the front panel of the BNC-2110. Refer to your
DAQ device user manual for information on using these signals.
Table 3 describes the digital screw terminals available on the front panel of
your BNC-2110.
Table 3. BNC-2110 Digital Screw Terminal Signal Descriptions
Screw Terminal Signal Description1
PFI<9..1> Programmable Function Input Lines 9
through 1
DGND Digital Ground—This pin supplies the
reference for the digital signals at the I/O
connector as well as the +5 VDC supply.
USER2 User-Defined 2—Connected to USER2
BNC. This screw terminal is used to provide
a user-definable BNC terminal.
FRQOUT Frequency Output—This output is from the
frequency generator output.
+5 V +5 V Power—These pins are fused for up
to 1 A of +5 V supply. The fuse is
self-resetting.
DIO<7..0> Digital Input/Output Lines 7
through 0—These pins can control the
up/down signal of general-purpose
counters 0 and 1, respectively.
CTR1OUT Counter 1 Output—This is the output from
the General-Purpose Counter 1 Output.
USER1 User-Defined 1—Connected to USER1
BNC. This screw terminal is used to provide
a user-definable BNC signal.

BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter 6 © National Instruments Corporation
Table 4 shows the BNC-2110 connectors that you connect to your DAQ
device.
SCANCLK Scan Clock—This pin pulses once for each
A/D conversion when enabled. The
low-to-high edge indicates when the input
signal can be removed from the input or
switched to another signal.
EXSTRB* ExternalStrobe—This output canbe toggled
under software control to latch signals or
trigger events on external devices.
AISENSE Analog Input Sense—This pin serves as the
reference node for channels ACH<0..15> in
NRSE configurations.
AIGND Analog Input Ground—The analog input
voltages are referenced to this node.
1 Refer to your DAQ device user manual for more information on using these signals.
Table 4. BNC-2110 Connectors and Device Map
BNC-2110
Connectors PCI-60XXE PCI-6110E PCI-6111E
ACH<0..7> ACH<0..7> ACH<0..3> ACH<0..1>
DAC0OUT DAC0OUT DAC0OUT DAC0OUT
DAC1OUT DAC1OUT DAC1OUT DAC1OUT
EXTREF EXTREF N/A N/A
PFI0/TRIG1 PFI0/TRIG1 PFI0/TRIG1 PFI0/TRIG1
CTR0OUT CTR0OUT CTR0OUT CTR0OUT
USER1 USER1 USER1 USER1
USER2 USER2 USER2 USER2
Table 3. BNC-2110 Digital Screw Terminal Signal Descriptions (Continued)
Screw Terminal Signal Description1

© National Instruments Corporation 7 BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter
Cabling
The BNC-2110 has one 68-position connector on the rear panel to connect
to your DAQ device. Refer to Table 5 to make this connection.
.
Caution Do not connect the BNC-2110 to any device other than the National Instruments
PCI-60XXE or PCI-61XXE devices. Doing so can damage the BNC-2110, the
DAQ device, or host computer. National Instruments is NOT liable for damages
resulting from these connections.
Installing Your BNC-2110
Refer to Figure 2 as you perform the following steps to connect your
BNC-2110 to your DAQ device. Consult your computer user manual or
technical reference manual for specific instructions and warnings.
Note You can either place the BNC-2110 on a workbench near the host computer or use
the available DIN rail-mount kit.
1. Make sure that switches ACH 0 through ACH 7 are set correctly for
your application.
2. Connect the BNC-2110 to your DAQ device. Refer to Table 5 to make
sure that you have the proper cable for the DAQ device that you are
using.
3. Connect the field signals to the BNC connectors and/or digital screw
terminal plugs. Refer to the Configuring Your BNC-2110 section
earlier in this guide for more information.
When you have finished using your BNC-2110, turn off any powered
external signals connected to your BNC-2110 before you turn off your
computer.
Table 5. BNC-2110 Cabling Options
DAQ Device Required Cable
100-pin MIO connector SH1006868
68-pin MIO connector SH6868, SH6868EP1, or R6868
50-pin MIO connector SH6850 or R6850
1 SH6868EP is necessary for use with 61XX DAQ devices.
!

BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter 8 © National Instruments Corporation
Figure 2. Connecting the BNC-2110 to Your DAQ Device
Warning The BNC-2110 is not designed for input voltages greater than 42 V, even if a
user-installed voltage divider reduces the voltage to within the input range of the
DAQ device. Input voltages greater than 42 V can damage the BNC-2110, any
device connected to it, and the host computer. Overvoltage can also cause an
electric shock hazard for the operator. National Instruments is NOT liable for
damage or injury resulting from such misuse.
Specifications
This section lists the specifications of the BNC-2110. These specifications
are typical at 25° C unless otherwise specified.
Field connection .....................................15 BNC connectors (8 analog
input connectors, 2 analog output
connectors, 1 counter, 1 trigger,
2 user-defined, and 1 external
reference)
Screw terminal........................................30-pin
Physical
Dimensions.............................................19.05 by 10.48 by 3.51 cm
(7.5 by 4.125 by 1.38 in.)
I/O connector..........................................One 68-position male connector
1 BNC-2110 2 Shielded Cable 3 DAQ Device 4 Personal Computer
3
4
1
2

© National Instruments Corporation 9 BNC-2110 Desktop and DIN Rail-Mountable BNC Adapter
BNC connectors.....................................15
Screw terminal plugs ............................. 30
Environment
Operating temperature............................0° to 70° C
Storage temperature ...............................–55° to 125° C
Relative humidity...................................5% to 90% noncondensing