Chapter 3: Interface Description
5040237 B 19
Rear Panel
There are several connectors on the rear panel of the Digidata 1550B digitizer: four BNCs, one
USB connector, one 25-pin connector, and one AC POWER input.
Figure 3-5: Rear Panel of the Digidata 1550B digitizer
Telegraph Inputs
The Digidata 1550B digitizer has a dedicated A/D converter that provides four telegraph input
channels on the rear panel. These telegraph input channels provide gain, frequency, and
capacitance values from manually-controlled amplifiers (for example, Axopatch™ 200B). These
inputs are independent of the 8 analog input channels. Computer-controlled amplifiers (such
as, MultiClamp™ 700A/B Microelectrode Amplifier and Axoclamp™ 900A Computer-Controlled
Microelectrode Amplifier) use software telegraph signals instead of such hard-wired telegraph
signals.
USB 2 Port
There is a single USB 2.0 type B female port on the rear panel for attaching a USB 2.0 cable to
allow connection to the USB 2 port on the host computer.
Digital Outputs
A DB 25-pin female connector is provided as an alternative way to access the
software-controlled digital outputs.
Note: Only digital outputs 0 through 7 are supported in existing Molecular Devices
software. See Appendix 5: Specifications on page 37 for pin definitions to make your
own cable.
ACPower
There is a single AC power input connector on the rear panel for the supplied AC power line
cord.
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