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APPENDIX A: RS-232 Serial Overview and Commands
Introduction
This document outlines Velodyne's Digital Drive (DD) RS-232 protocol specification. This protocol
indicates how Velodyne 1812 and Digital Drive products receive run-time commands from devices
such as Creston Universal Remote Controls.
Com Port Setup
Use standard communications settings: Baud Rate: 9600, Data Bits: 8, Parity: None, Stop Bits: 1
DD IN and OUT Port Pin Configuration
DD serial ports use a standard configuration that allows direct connection to a PC via a FEMALE to
MALE serial cable. It uses only 3 pins (Transmit, Receive, Ground). The pin configurations are:
IN:
Pin 2 = Transmit
Pin 3 = Receive
Pin 5 = Ground
OUT:
Pin 2 = Receive
Pin 3 = Transmit
Pin 5 = Ground
Runtime Command Format
Byte Number
0
'#'
1 to 3 or 4
Command and Parameter Data
4 or 5
'$'
Velodyne Digital Drive User's Manual
Byte Description
Notes
Header Character
3 to 4 ASCII characters, see formats on next page.
Case sensitive - CAPS ONLY!
Termination Character (required or command is
ignored)
(continued next page)
Page 27
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