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GS-C200

INTELLIGENT STEPPER MOTOR CONTROLLERS

STMicroelectronics 

GS-C200 / GS-C200S

GS-C200 AND GS-C200S DESCRIPTION

The increasing popularity of microprocessors and

their very low cost, have contributed to a fast growth

of stepper motors usage in a large numbers of

application previously covered by more complex,

bulk and expensive DC motors servo loops. The

GS-C200 and the GS-C200S modules have been

conceived to help the industrial designer in design-

ing the stepper motor applications based on micro-

processor control.

These modules are programmable intelligent step-

per motor controllers that coordinate highly com-

plex movements and sequential operations. This

capability is performed through the integration of

sophisticated hardware and an easy to learn and

very functional and powerful programming lan-

guage.

Thanks to this high level programming language,

the power of the instruction set and the ability to

condition and control the program execution

through the USER inputs and outputs, the GS-C200

and GS-C200S drastically reduce the design time

and start-up manufacturing phase of very complex

systems. The GS-C200S offers an advanced and

powerful instruction set that includes also the con-

ditional jump which allows for more efficient pro-

gram-ming. The GS-C200, the GS-C200S and their

companion modules, the GS-D200 and the GS-

D200S, can be used to drive in chopped mode of

bipolar stepper motor with a 2/2.5A maximum

phase current rating.

The two modules (GS-C and GS-D) are available

also on a single Eurocard board named respec-

tively GS-DC200, GS-DC200S and GS-DC200SS

according to the various modules combination (see

the relevant data sheet). In the following the mod-

ules will be generically named GS-C. The specific

module part number will be used when the feature

is unique to that module.

A MOTION SYSTEM ARCHITECTURE

A complete motion system controlled by a host

computer is normally configured as per fig. 3.

The GS-C logical and functional architecture is

shown in fig. 1 and it includes the following basic

blocks:

– Interface to the Host Computer via an RS232

communication port.

– Address and baud rate selection.

– Interface to the Sequencer-Driver (in particular

but not exclusively, to the GS-D200 or GS-

D200S) via 5 output and 3 input lines

– Command Interpreter and Executor.

– Program storage area

– Power Supply.

The above mentioned functions are performed by

the GS-C without the addition of any external com-

ponent, and the module flexibility is further en-

hanced by the use of only one unregulated supply

voltage that can be the same used to supply the

Sequencer-Driver (from 12V up to 40V).

Commands are sent to the module by a Host Com-

puter or by a simple video terminal during the

programming/debugging phase through an RS232

serial port. They are interpreted and validated by

the command interpreter and executed through the

Sequencer-Driver interface.

Command execution can be conditioned and con-

trolled by the status of the USER IN-OUT interface.

A program storage area has been added to perma-

nently store a program in an on-board EEPROM;

this is particulary beneficial to obtain a low cost

stand-alone controller that does not need any con-

nection to an external computer or to store pro-

grams frequently used in complex motion

sequencies thus reducing the host computer bur-

den and speeding up the system processing.

Particular attention has been given to the simplicity

of the instruction set to allow an easy design of the

system to those designers that are not very familiar

with microprocessor software and programming.

In the following a detailed description of the various

functional blocks is given.

Figure 3. A Motion System Block Diagram

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