ABC Office DC-2, MC-1 manual Physical Layer, DB-9 RS232 Connector, Serial Port Driver

Lexicon, Inc.
DC-2/MC-1 Serial Communications Protocol	Printed on: 10/19/00

The DC-2/MC-1 uses simple notification, command, response and acknowledgment packets to have communication transactions with a given HOST. This protocol is designed for point to point communication between a HOST and DC-2/MC-1. The DC-2/MC-1 Protocol is a 3 layered system. The DC-2/MC-1 serial protocol allows for the DC-2/MC-1, or the HOST to initiate a communication transaction. Most transactions are initiated by the HOST. DC-2/MC-1 then responds to the HOST command with either a response or acknowledgment packet. There are a few asynchronous notifications that DC-2/MC-1 initiates indicating system changes. Each transaction initiated must wait for a corresponding response before initiating the next transmission.

The 3 protocol layers are: Physical, Data Link, and Application Layers.

Physical Layer (RS232)

Data Link Layer

Application Layer

5 Physical Layer

5.1 DB-9 RS232 Connector

Dc-2/MC-1

Ch A	Transmit Data	2
Ch A	Receive Data	3
Ch A	Ground	5

9Pin D-Shell (female) lower connector

Typical Host

2Rx Data

3Tx Data

5Ground

9-Pin D-Shell (male)

Note: The wiring requirements for a 9 pin to 9 pin serial connection, are a male to female straight through cable.

5.2 Serial Port Driver

DC-2/MC-1 serial port has been setup to operate as follows:

Operating Mode:	Full Duplex
Baud rate:	19.2K baud
Data Size:	8 bits
Parity:	Odd
Stop Bits:	1

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