Measurement-computing USB-1096HFS Instrukcja Użytkownika Pobierz pdf (Strona 18)

USB-1096HFS User's Guide Functional Details

Ground terminals

The USB-1096HFS has four identical ground (GND) connections - one ground terminal per digital port group.

The ground terminals provide a common ground for all USB-1096HFS functions.

Counter terminal

Connect an external TTL signal to the screw terminal labeled CTR. The internal counter increments when the

TTL level transitions from low to high. The counter can count frequencies of up to 1 MHz.

Daisy chaining additional modules to the USB-1096HFS

Daisy chained MCC USB Series products connect to the USB bus through the high-speed hub on the USB-

1096HFS. You can daisy chain a maximum of four USB boards to a single USB 2.0 port or USB 1.1 port on

your computer. Use the supplied cable or an equivalent cable when daisy chaining MCC USB Series products.

Depending on your load requirements, you may need to supply external power to each MCC USB Series

product that you want to daisy chain. Refer to the next section "Power limitations using multiple USB-1096HFS

devices" for more information.

MCC USB Series products are USB 2.0 full-speed devices that provide a signaling bit rate of 12 Mb/s. The

throughput rate is shared by all devices connected to the USB bus.

To daisy-chain two or more USB-1096HFS modules, follow the steps below. This procedure assumes you

already have one USB-1096HFS connected to a computer and to the external power source. The USB-1096HFS

already connected to the computer is referred to as the connected module. The USB-1096HFS you want to

daisy-chain to the connected module is referred to as the new module.

Connect the USB OUT connector on the connected module to the USB IN connector on the new module.

Connect the

POWER OUT connector on the connected module to the POWER IN connector on the new

module.

For each additional module you want to add, repeat steps 1-2, with the module you just daisy chained now

being the connected module.

A daisy chain system is shown in . Note that the last board in the chain is supplied with external

power.

Figure 3-4

Figure 3-4. USB-1096HFS daisy-chain connections

USB port to

USB IN

USB OUT

to USB IN

POWER OUT to

POWER IN

USB OUT

to USB IN

PWR

9V3A supply

POWER IN

PWR

9V3A supply

POWER IN

3-5

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 26 27

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