User manual

analog outputs and > 8 high-speed digital outputs are not supported with WinLTP 2.10 but will be in

subsequent versions – so there is no need to buy the second cable and additional connections now.)

You could also use other connector boxes such as the SCB-68 Shielded Connector Box, but there is little

point, as it is about the same cost as the others, and only has screw terminal outputs.

NOTE: WinLTP 1.10 and earlier was only set to run in the NRSE (Non-Referenced Single-Ended) mode.

WinLTP111 and later can now be set up in Differential and RSE (Referenced Single-Ended) modes as

well as the NRSE mode.

When using M- or X-Series board and connector boxes, the recording mode must be set on program

startup to either Differential, Non-Referenced Single-Ended (NRSE) or Referenced Single-Ended (RSE)

as described in Section 2.8. For certain boxes, such as the BNC-2110 and the BNC-2120, the preferred

recording mode (Differential in these cases) is already chosen. For other connector boxes such as the

BNC-2090A or the CA-1000 connector box with All Pins Available, you can choose Differential, NRSE or

RSE. If you wash to use the BNC-2110 or BNC-2120 in NRSE or RSE mode, choose the ‘Connector box

with All Pins Available’.

Also, for some connector boxes, such as the BNC-2110 and the BNC-2120, each channel in the

connector box can be set to record from Floating Source (FS) Signals such as battery powered biological

amplifiers NOT connected to mains ground, or from Ground Source (GS) Signals such as biological

amplifiers connected to mains ground to connector boxes.

For information on connecting Floating Source (FS) Signals and Ground Source (GS) Signal and using

Differential, NRSE or RSE recording modes, see Fig. 2.4.3.1. Also see the detailed discussion in Field

Wiring and Noise Considerations for Analog Signals – both from the National Instruments website.

NOTE: Even though the Resources tabsheet is specifically set up for BNC-2110, BNC-2120 and BNC-

2090A connector boxes, if you choose the “Connector Box with All Pins Available”, you can set up

connections in any recording mode to any connector box. This includes a USB M-Series board and box,

a CA-1000 box with your own custom connections, or even the BNC-2110, BNC-2120 boxes in any

recording mode.

Use Differential, NRSE or RSE mode to connect a Floating Signal (FS) Source such as a battery powered

biological amplifier NOT connected to mains ground. Usually use Differential or NRSE to connect a

Grounded Signal (GS) Source such as a biological amplifier connected to mains ground.

Note that in general the Analog In Ground pins, the Analog Out Ground pins, and the Digital Ground pins

are internally connected and thus the same ground (ie if you measure the resistance between two

different ground pins, it is 0 ohms. However, National Instruments recommends that the reference ground

of analog inputs be connected to an Analog In Ground pin, the reference ground of analog outputs be

connected to an Analog Out Ground pin, and the reference ground of digital outputs be connected to a

Digital Ground pin.