Physical Layer; Db-9 Rs232 Connector; Serial Port Driver - Lexicon DC-2 Protocol Manual

Lexicon, Inc.
DC-2/MC-1 Serial Communications Protocol
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)

5 Physical Layer

5.1 DB-9 RS232 Connector

Dc-2/MC-1
Ch A Transmit Data
Ch A Receive Data
Ch A Ground
9 Pin D-Shell
(female) lower
connector
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:
Baud rate:
Data Size:
Parity:
Stop Bits:
Data Link Layer
Application Layer
2
3
5
Typical Host
2 Rx Data
3 Tx Data
5 Ground
9-Pin D-Shell
(male)
Full Duplex
19.2K baud
8 bits
Odd
1
Printed on: 10/19/00
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