SIIG 1-Port ECP Especificações descarregar pdf (Página 9)

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EPP2000 Special Interface Signals

The above DB25 computer interface connector contains user defined signals specific for the

EPP2000 spectrometer on pin 12, 13, and 15. Any of these signals can be mounted to rear

panel jacks via special request.

Pin 12 is an EPP2000 spectrometer output to indicate start of scan. This may be tied to a

XENON strobe lamp’s trigger input to flash the lamp at the beginning of each scan.

Pin 13 is used to supply power to the EPP2000 spectrometer when the USB2EPP cable is

used or multiple units are connected on the same ribbon cable. Note that the power supply

must be capable of providing the appropriate current for the number of units connected. Each

standard unit requires 250ma of current at +5VDC. We recommend that a power adapter be

used with the USB2EPP cable for best performance. LT12 and LT14 spectrometer electronics

require just 100ma, however spectrometers with an integrated TE temperature regulator, such

as LT14 NIR-InGaAs spectrometers, require 1300ma.

Pin 15 is used as a syncronizing input to the EPP2000 spectrometer. It provides a hardware

scan enable when high (and scan disable when low). TTL switching delay is less than 1 micro-

second.

EPP2000 Unit Address Selector

For multi-channel applications, multiple units may be connected to the same parallel ribbon

cable using different unit address selections. However, if the USB2EPP cable (Universal

Serial Bus USB-2 ) is used, all EPP2000 spectrometers are set to the same unit address of 1.

Parallel cables with extra DB25 male connectors are available or can be easily fabricated. Up

to 8 units can be connected in this way. Each unit has a unit selector dial that can be set to the

desired unit address. The instrument may be addressed as unit 1-8 through a small pinhole

adjacent to the DB25 female connector on the rear panel. The factory default selection is unit

1. The selector switch is a rotary dial that has a vertical slot when unit 1 is selected. Using a

jeweler’s screwdriver turning clockwise 1 click will select unit 2 (then unit 3 and so on).

EPP2000 Power Requirements

A standard EPP2000 spectrometer requires a 220-250ma (milliamps) at +5VDC. The power

supply must be regulated. A single unit may be powered by a 300ma +5VDC wall transformer

with 5% regulation. Up to 4 units can be powered by a 1 amp +5VDC wall transformer with

3% regulation. The input power on the EPP2000 is a 2.5mm male power jack (the wall

transformer must have a 2.5mm female connector).

LT12 (Little Turbo 12-bit) and LT14 (Little turbo 14-bit) spectrometers require only 100ma.

Look for the LT12 or LT14 identification on the bottom label.

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SIIG 1-Port ECP Especificações Página 9