Rockwell-automation 2098-DSD-xxx Ultra3000 Host Commands for Serial In Instrukcja Użytkownika Pobierz pdf (Strona 168)

Publication 2098-RM003A-EN-P October 2001

C-4 Using Host Commands

Exercise #1 – Enabling

Setpoint Velocity Control

This exercise transmits the command that places the drive in the

setpoint velocity Host Control Mode, which allows the drive to accept

velocity commands using host commands. The command string

parameters to enable the Setpoint Velocity Host Control Mode are:

Note: The numbers are hexadecimal.

1. Calculate the checksum.

Note: The colon that signifies the beginning of a command is

ignored when calculating the checksum.

A. Sum the ASCII values for each character in the command

string. Refer to ASCII Conversions on page C-8 for the ASCII

values.

B. Subtract 393 from 256.

C. Convert –137 to hexadecimal (–137 = 0xFFFFFF77 Hex).

Note: Use the Windows calculator feature to convert –137 to a hex

value. The calculator is in the Accessories section. Be sure to

switch it to scientific functions.

2. Assemble the complete command by appending the two least

significant digits of the checksum hex value, 77, to the end of the

command string and prefixing the string with a colon.

3. Type the command string into Hyperterminal followed by the

Enter key. The Ultra3000 drive is now ready to accept velocity

commands.

Command String :00061101cc Parameters

cc Checksum

01 Data

1 Function

061 Parameter

00 Drive Address

Hex Character 00061101cc

ASCII Value 48 48 48 54 49 49 48 49

ASCII Sum — 96 144 198 247 296 344 393

256 - 393 = -137

Command String :0006110177

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 174 175 176

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