User guide

SERIAL RS485 COMUNICATION
PAGE 35AMIS-DMA1 INSTALLATION & OPERATION MANUAL
9.13 Basic protocol with CheckSum
Reading the data of the DMA1 from the control system
Transmission sequence
DMA1
Sending a command to the DMA1 from the Control System
Transmission sequence
Control System
DMA1
Control System
S
T
X
A
D
D
C
M
D
D A T A
E
T
X
E
N
Q
A
D
D
C
M
D
E
N
Q
A
D
D
C
M
D
D A T A
N
A
K
A
D
D
C
M
D
E
R
R
A
C
K
A
D
D
C
M
D
The DATA block
is inserted only
if provided for by
command used
C
H
K
C
H
K
*
*
C
H
K
1. The CheckSum is introduced if the confi guration parameter CMCK=1.
2. The CheckSum is calculated summing all the characters marked by an asterisk.
*