GS-C200 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
GS-C200 Datasheet PDF : 31 Pages
| |||
GS-C200 / GS-C200S
Direct execution commands are immediately actu-
ated. They include: start and stop the program
execution, set the programming mode, check posi-
tion, check I/O, etc...
Delayed execution commands are run when re-
quested by the sequence currently stored in memo-
ry. By using a combination of these commands, it
is possible to perform very complex movements
including also the conditioning by external stimulus,
the iteration of a specific sequence for a defined
number of times.
Utility commands allow the GS-C modules to per-
form several additional functions such as the detec-
tion of the position, phase current optimization etc...
These commands, when properly used, speed up
the system debugging phase and they increase the
system efficiency.
Note: To easily learn how to program the GS-C and to minimize
development time, a P.C. based self explaining and interactive pro-
gram named F.A.S.T. (First Advanced Stepper motor Training pro-
gram), able to communicate with the module by using the
Point-to-Point protocol, has been developed and it is available to the
end user. (See GS-C200PROG data sheet).
Command strings can be easily implemented also
by using a high level language such as BASIC, or
they can be generated by a dedicated microcontrol-
ler programmed in machine language. The dia-
logue speed is limited by the time required to
construct the command string and to analyze the
GS-C data, and it results noticeabily reduced when
a ”machine language” program is used.
The program, after testing, can be stored in the
EEPROM included in the GS-C module and then
loaded and automatically executed at power-up,
resulting in a low cost stand-alone system. It is also
possible to save the program as a DOS file on a
floppy disk for future retrieval, or to ease the field
update of the program itself.
Every command is identified by one or two charac-
ters and by a variable length argument (from 0 to 7
characters). If the Multipoint communication proto-
col is used, the address is specified by the number
that preceeds the command. All the commands
sent by the Host, as well as the data generated by
the GS-C, are terminated by a Carriage Return
(ASCII value = 0D).
In the following pages all the commands which may
be executed by the GS-C200 and the GS-C200S
are detailed, as well as their format. A practical
example of the command usage is also given. The
presence of an asterisk at the end of the command
denotes that the command is executable only by
the GC-C200, while two asterisk denote a com-
mand executed only by the GS-C200S.
Each command is shown in the same format used
during the programming phase, i.e. the command
identifier plus the argument:
Gsxxxxxxx
The argument can be single, double or missing
according to the various command types.
The various argument are identified by different
letters according to the particular type i.e.:
s = sign + or –
x = figure 1 to 3
y = figure 0 to 7
v = value 1 to 999 depending on command
p = position 1to 999999 incremental or the
absolute position
Apart the different number of executable com-
mands and functions, the GS-C200S and the GS-
C200 look very similar each other. The only
foundamental difference is the way they manage
the position counter.
The position counter is the reference ruler for the
microprocessor to move correctly from the actual
position to the targeted one, executing the proper
number of steps in the right direction.
The GS-C200 position counter allows a maximum
of ten million steps to be executed, and the home
position corresponds to the 0 count position. When
a movement is larger than the position ruler limits
an Error 5 is reported to the Host.
The GS-C200S position counter allows a maximum
total count of 224 step ranging from –8388608 to
+8388607 steps. When the maximum count is ex-
ceeded the counter wraps-around. For example if
the position counter is +8388606 and a +5 steps
movement is executed, the final position will be:
+8388606 Initial position
+8388607 After 1 step execution
–8388608 After 2 steps execution
–8388607 After 3 steps execution
–8388606 After 4 steps execution
–8388605 Final position
Of course no error is reported.
13/31
Share Link: 