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GS-C200S Arkusz danych(PDF) 9 Page - STMicroelectronics

Numer części GS-C200S
Szczegółowy opis  INTELLIGENT STEPPER MOTOR CONTROLLERS
Download  31 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

GS-C200S Arkusz danych(HTML) 9 Page - STMicroelectronics

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INTERFACE TO THE HOST COMPUTER AND
DATA PROTOCOL
The interface to the Host Computer is through an
RS232 or V24 serial communication port.
Baud Rate Programming
The Baud rate is programmed between 110 and
9600 bit/sec by using the BR0, BR1 and BR2 inputs
according to the following table:
BR0 (p4)
BR1 (p5)
BR2 (p6)
Baud Rate
0
0
0
9600
1
0
0
4800
0
1
0
2400
1
1
0
1200
0
0
1
600
1
0
1
300
0
1
1
150
1
1
1
110
This setting is obtained by connecting the pins 4, 5,
and 6 to ground (0 status) or by leaving them open
(1 status). The communication port does not use
any control line but just the transmit and receive
signals. The host computer must handle the data
excange in the proper way.
Module Address Programming
The communication protocol can be either Point to
Point or Multipoint. In the first case a single com-
munication line is required for each module, while
in the latter more than one module (up to seven)
can share the same communication line.
The Multipoint protocol as well as the peripheral
device address are selected through SEL0, SEL1
and SEL2 inputs. The Point-to-Point protocol is
selected by connecting all the SEL inputs to the 5V
output pin (pin 20) or by leaving them open.
The following table defines the protocol and the
address setting:
SEL2
SEL1
SEL0
Address
Protocol
0
0
0
7
Multipoint
1
0
0
6
Multipoint
0
1
0
5
Multipoint
1
1
0
4
Multipoint
0
0
1
3
Multipoint
1
0
1
2
Multipoint
0
1
1
1
Multipoint
1
1
1
Point-to-Point
9/31
When the multipoint connection is chosen, the ad-
dress of each module is obtained by connecting the
various SEL pin (1, 2, 3) to ground (0 status) or by
leaving them open (1 status).
The basic difference between the two protocols is
represented by the sytem wiring complexity and the
data throughput. The Point-to-Point offers the
higher throughput data rate but it requires a con-
necting cable for each unit, while the Multipoint
minimizes the connecting cables but at reduced
throughput rate. When this latter protocol is chosen,
the command must always be preceeded by the
address of the unit.
Data Exchange Protocol
The dialogue is always driven by the Host Com-
puter which sends the string containing the com-
mand or the request to be implemented. The GS-C
module stores the instruction sent by the Host and
then it checks if the string has been correctly re-
ceived by analyzing the parity bit. It then analyzes
the consistency of the received instructions by veri-
fying the presence and correctness of the argu-
ment, and finally, it checks whether the request can
be processed or not (for example, an attempt to
move outside the system limits, etc.) reporting to
the Host the analisys result. If no error is detected,
the GS-C replies to the Host by a ”Y” message. In
case of error, the message will be ”Error X” request-
ing the Host to send the message again or to modify
some parameters of the previous message to fix the
error detected by the GS-C. The actual value of X
(see fig. 4 and error code table) gives the Host the
information on the type of detected error. The pro-
cedure implemented for the dialogue with the Host
is shown on the flowchart of fig. 4.
Figure 4. Controller-Host Dialogue Flowchart.
GS-C200 / GS-C200S


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