Measurement-computing USB-ERB08 Manuel d'utilisateur télécharger pdf (Page 17)

USB-ERB08 User's Guide Functional Details

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

module.

This step is required only if you plan to daisy chain power to another module.

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

To add another module, repeat steps 1-2, with the module you just connected now being the connected

module.

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

power.

Figure 3-5

Figure 3-5. Daisy chain connections

USB port to

USB IN

USB OUT

to USB IN

USB OUT

to USB IN

POWER OUT

to POWER IN

CB-PWR-9

supply

to POWER IN

CB-PWR-9

supply

to POWER IN

Power limitations using multiple USB-ERB08 devices

When daisy chaining additional MCC USB Series products to the USB-ERB08, you must ensure that you

provide adequate power to each board that you connect. The USB-ERB08 is powered with a 9 VDC nominal,

1.0 A external power supply.

When connecting multiple modules, power supplies with higher current capability, such as the CB PWR-9V3A,

are available from MCC.

Voltage drop

A drop in voltage occurs with each board connected in a daisy chain system. The voltage drop between the

power supply input and the daisy chain output is 0.5 V maximum. Factor in this voltage drop when you

configure a daisy chain system to ensure that at least 6.0 VDC is provided to the last board in the chain.

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Measurement-computing USB-ERB08 Manuel d'utilisateur Page 17