Physical Layer; Serial Port Driver; Errors - Lexicon MC-4 V1.00 - SERIAL PROTOCOL DEFINITIONS REV 1-6 Manual

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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)

4.1 Physical Layer

DB-9 RS232 Connector
MC-4
COM1
Transmit Data
2
Receive Data
3
5
Ground
9 Pin D-Shell (female)
Note: The wiring requirements for a 9 pin to 9 pin serial connection are a male to female straight through
cable.

4.2 Serial Port Driver

MC-4 serial port has been setup to operate as follows:
Operating Mode:
Baud rate:
Data Size:
Parity:
Stop Bits:
Hardware Handshaking:

4.3 Errors

The MC-4 will detect parity, framing, and data overrun errors. If any of the physical layer errors are
detected, the complete packet is corrupted and the MC-4 will reset the transaction and begin to look for a
start of packet byte.
Data Link Layer
Application Layer
9 Pin D-Shell (female)
2
3
5
9 Pin D-Shell (male)
MC-4 Serial Communications Protocol
Host
2 2
3 3
5 5
Full Duplex
19.2K baud
8 bits (1 byte)
Odd
1
None
Receive Data
Transmit Data
Ground
9 Pin D-Shell (male)
6