Rockwell Automation 2098-DSD-xxx Ultra3000 Host Commands for Serial Interface - Manual (Page 13)

1 Publication 2098-RM003A-EN-P October 2001
Chapter
1
Communications Protocol
Introduction The drive command protocol is similar to others in the industry. It is a
master - slave protocol where the host computer is the master and the
drive is the slave. This chapter provides details on the following
aspects of the Ultraware Serial Communications Protocol:
• Command Format
• Host Command Description
• Drive Response Description
• Exception Responses
Command Format The command format is shown below:
Each letter represents a single ASCII character. In the address,
parameter, function, data, and checksum fields, the characters should
all be ASCII hex values, i.e., they should be in the range 0 through 9
and A through F (upper case only).
All commands begin with a colon (0x3A), and terminate with a
carriage return (0x0D).
Host Command Description The address field is made up of two characters. These characters
supply the address of the drive that the command is intended for. For
example, a host addressing drive #2 would have 0x02. The address
field allows drive addresses from 0x00 through 0xFD, or 254
individual drives.
The parameter field specifies the parameter in the drive that is being
accessed, which can range from 000 to 7FF, or 2048 possible
parameters.
Start Address Parameter Function Data Checksum End
: a a p p p f d ... d c c