Specifications

backwards, the communications board will not operate. Place the cathode side of the LED to line up

with the silkscreened bar on the PCB.

R7 - 1K ohm

D1 - HLMP1790 LED

Note:

The LED is rated for 2ma. If a higher current model is substituted, the Communications board will not

work. You can decide not to install the LED, since it just indicates download mode. The download

mode will also be indicated on your computer screen while Interactive C is sending out the pcode.

Tech America (1-800-877-0072) sells a 3ma LED (model#90-1555) that can be substituted for the

HLMP-1790. The resistor R7 value must be increased to 2.2K, or else the current drain from the LED

will prevent communications

Step 18

Install switch S1 and S2.

S1, S2 - momentary normally open push button switch.

Use the middle two sets of holes on the PCB when installing the switches.

Step 19

Install connector P1 and header JP15.

P1 - Female DB9 pin connector

JP15 - Header 3x2

Note:

If you have the one piece Finger Board with attached Communications board, you do not have to

install JP15. There are already pcb traces connecting JP14 to JP15.

Step 20

To connect the main CPU board to the Communications board, you will need a short length of ribbon

cable and two female IDC connectors (3x2). When making the cable, make sure pin 1 line up together

on both connectors. The ribbon cable length should be no more than 1 foot between the CPU board

and Communications board. Serial communication errors may occur if cable is too long due to noise.

If you need a longer length from your computer to the Finger Board, then increase the length of cable

going from the Communications board to the PC serial port, since this length can be as long as 25ft.

Step 21

When using Interactive C, the Finger Board supports a 16x2 line LCD module connected to header

JP2. To connect the LCD module, you will need a short length of ribbon cable and two female IDC

connectors (7x2). When making the cable, make sure pin 1 line up together on both connectors. The

ribbon cable length should be no more than 1 foot.

Note:

If you cannot locate a LCD module, you can purchase one directly from EAS. The cable is included in

the price.