phytron MCD+, Руководство пользователя

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phytron
37 MA 2102-A005 GB
9 Bus Connection Configuration
If operating more than one MCD device (max. 16) at one serial interface, the RS485 field
bus is the best choice.
Many parameters in the MCD can be set by the serial bus connection. Thus, a safe
stepper motor operation with correct preset parameters is assured.
9.1 Definition
The bus connection is defined as follows:
•
RS485: 4 wire connection, also point to point connection possible
•
Signal input: R+ R-
•
Signal output: T+ T-
•
insulated from the motor voltage by means of optocoupler
A well-defined protocol should be followed to assure a safe data exchange:
Asynchronous transmission, 8 bits/byte, 1 stop bit, 1 parity bit
Transmission rate: 57600 Baud
Permanent telegram format:
<STX> <address_H><address_L> <instruction> <value> : <csh> <csl> < ETX>
<STX> Start-of-text character, 02
H
<address_H> High-order byte of the power stage address 00
H
...0F
H
,
0
D
…15
D
; Admissible characters: 0…F
<address_L> Low-order byte of the power stage address 00
H
...0F
H
,
0
D
…15
D
; Admissible characters: 0…F
<instruction> Instruction byte: A....Z
<value> Data byte
: Colon as separator, to distinguish between usable data
and checksum
<csh> Upper byte of the 8 bit checksum value
<csl> lower byte of the 8 bit checksum value
< ETX> End-of-text character, 03
H