Technical Support Document 001 - 4/96

CC READER RS-232 INTERFACE INSTALLATION

This document outlines the modification of a CC Reader for connection to RS-232 devices, such as a personal computer (PC). The following parts are required for this operation:

1 - U32: RS-232 Line Driver IC Chip

4 - 22uF Tantalum Capacitors

1 - RS-232 Interface Cable

These parts are available as a kit from ZBE, Inc. For more information, please contact our offices at (tel) 685-2348 or (fax) 685-9568.

The Modification:

• To install the RS-232 parts, the CC Reader must be unplugged from all cabling, and the case dis-assembled. Inside the front half of the case, the circuit board is secured by four screws, which should be removed to render the circuit board completely free of the enclosure.
  
• Refer to the drawing below for the locations of the components required for the RS-232 modification:

The Following page contains notes about the RS-232 Interface cable.

Cabling and Protocol Information:

• Once the RS-232 Line Driver IC chip and it's four Tantalum Capacitors are installed, the RS-232 Interface Cable should be installed on the rear (solder side) of the circuit board. The drawing below shows the pinout of the three-position connector on the CC Reader circuit board.

• The Interface Cable has the following pinout, for a standard connection to a personal computer's 9-pin serial port:

• The CC Reader's baud rate and other serial specifications are: 7 data bits, No Parity, 2 stop bits. It communicates at 9600 baud.
  
• The CC Reader has only one instruction through the serial interface, which is to return it's current readings. This is accomplished by sending a capitol letter 'Q' to the unit, which will cause it to respond with an ASCII string with the RGB information.

CC READER RS-232 PROTOCALL

RS-232

9600 baud

7 data bits

2 stop bits

no parity

CONNECTOR

D-9 Female

Transmit: Pin 2

Receive: Pin 3

Ground: Pin 5

This connector is pinned out for direct connection to IBM AT serial port.

PROTOCALL

1. Transmit a "Q" or "q" to the CC Reader to query.
2. CC Reader responds with: Cxxx, Mxxx, Yxxx<cr>

Example: Cyan: 0 Magenta: 50 Yellow: 70 responds as

C000, M050, Y070<cr>