61
RUDOLF - Ref. : CDR 27 028_gb
R-DPA96 A/AN
- RS485 - JBUS/MODBUS
®
COMMUNICATION
The JBUS/MODBUS
®
used by the
R-DPA96 A/AN
involves a dialogue using a master-slave hierarchical
structure. There are two possible dialogues:
• the master communicates with a slave (
R-DPA96
)
and waits for its reply
• the master communicates with all the slaves (
R-
DPA96
) without waiting for their reply.
The mode of communication is the RTU (Remote
Terminal Unit) using hexadecimal characters of at least
8 bits.
According to the JBUS/MODBUS
®
protocol, transmission
time must be less than 3 silences, i.e. the emission time
of 3 characters so that the message is processed by
the
R-DPA96
.
To correctly use information, the following functions are
important:
3 : to read n words (maximum 128).
6 : to write one word.
8 : to diagnose exchanges between the master and
the slave via meters 1, 3, 4, 5 and 6.
16 : to write n words (maximum 128).
NB:
When selecting slave address 0, a message is sent to
all the instruments present on the network (only for
functions 6 and 16).
Comment :
The response time (time out question/answer) is 250
ms maximum
THE STANDARD COMMUNICATIONS FRAME
Slave address
Function code
Address
Data
CRC 16
The standard communications frame consists of:
Summary of Contents for Rudolf R-DPA96 A
Page 25: ...25 R DPA96 A AN RUDOLF Ref 876 583 A DPA96A DPA96A DPA96A DPA96A x 1 x 2 x 3 x 4 OPERATION...
Page 27: ...27 R DPA96 A AN RUDOLF Ref 876 583 A DPA96A DPA96A DPA96A x 9 x 10 x 11 DPA96A x 12 OPERATION...
Page 28: ...28 RUDOLF Ref 876 583 A R DPA96 A AN DPA96A DPA96A DPA96A x 3 x 1 x 2 OPERATION...
Page 43: ...43 RUDOLF Ref 876 584 A...
Page 44: ...44 RUDOLF Ref 876 584 A...
Page 53: ...53 SOCOMEC R f 876 585 A...
Page 54: ...54 SOCOMEC R f 876 585 A...
Page 129: ...129 RUDOLF Ref 876 341 A...
Page 130: ...130 RUDOLF Ref 876 341 A...
Page 139: ...139 RUDOLF Ref 876 586 A...
Page 140: ...140 RUDOLF Ref 876 586 A...
Page 152: ...152 RUDOLF Ref 876 587 A...
Page 168: ...OPERATION DPA96A DPA96A RUDOLF Ref 876 588 A R DPA96 A AN R Module 7 Memory 168...