Working With Modbus; Read Commando; Write Commando - Jakka Control Kit 4 Manual

Manual
2.4.4

Working with Modbus

The Modbus communication goes from the Main (MN) board, MN is slave. The data goes from MN to the Remote
Control (RC) with communication protocol Senso Argus link. The RC is master and the MN is slave. The Modbus
is 8 times faster as the Senso Argus Link communication. First the data has to be send to RC and back before the
Modbus master can send the next command. Modbus does not communicate with MN after 60 seconds the RC is
going out and Modbus is no longer master.
MODBUS
MASTER
The figure is showing the communication between RC and MN with Modbus and Senso Argus Link. The
is read communication and the
paragraphs the packets are explained.
2.4.4.1

Read Commando

The table on the right shows an example of a

MN is receiving Read commando 03

MN asks data of Read buffer

RC sends Write module data to Read Buffer of MN
2.4.4.2

Write Commando

The table on the right shows an example of a

MN is receiving Write commando 06

MN Write buffer receives data

MN Set write disable bit in MN Write buffer

MN Set write disable bit in MN Read buffer

RC reads MN Write buffer in Read module

RC Write module reads Buffer

RC Reset write disable bit in Write buffer

RC Write module sends to MN Read buffer

MN Reset write
The packets can be written if:

Data byte is with in the right range

The write disable bit zero is.
9
READ
BUFFER
WRITE
BUFFER
red is write communication beginning with the Modbus packets. In the next
Read frame.
Write frame.
disable bit in MN Write buffer
JAKKA Control Kit 4
M F
F
A
A
N
N
EXHAUST
C
RU
M FAN
H
WRITE
ARGUS
LINK
READ
Bytes Description
01 # slave
03 commando
00 start addr H
00 start addr L
00 # data H
01 # data L
84 Checksum H
0A Checksum L
Bytes Description
01 # slave
06 commando
00 start addr H
00 start addr L
00 # data H
00 # data L
89 Checksum H
CA Checksum L
S
1 2 º
BY FI
TI R
D SCH O
SEL
BUFFER
blue line
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