Communication - socomec DIRIS A20 Notice D'utilisation

DIRIS A20 - RS485 - JBUS/MODBUS

COMMuNICatION

The JBUS/MODBUS used by the DIRIS A20 involves
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a dialogue using a master-slave hierarchical structure.
There are two possible dialogues:
• the master communicates with a slave (DIRIS) and
waits for its reply
• the master communicates with all the slaves (DIRIS)
without waiting for their reply.
the StaNdard COMMuNICatIONS fraMe
The standard communications frame consists of:
Slave address Function code
According to the JBUS/MODBUS
sion time must be less than 3 silences, i.e. the emission
time of 3 characters so that the message is processed
by the DIRIS.
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).
NeW COMMuNICatION taBle frOM 01/2009
Caution: These new tables are available for all new Socomec products on sale from January 2009.
The aim is to have common tables for common values, irrespective of the Socomec product.
We recommend that you use these new tables whenever possible for developing your applications.
List of available communication tables
Tables Description
C550 C550 Hex : Metrology with CT/VT Affected
C650 C650 Hex : Energy
C750 C750 Hex : Statistics
C850 C850 Hex : Metrology W No CT/VT Affected
C950 Hex C950 Hex : Harmonics
E000 E000 Hex : Setup
E220 Hex E220 Hex : Action system (Write access only)
TABLE C550 Hex : Main measurements allocated from CT (current transformer) and VT (voltage transformer)
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The mode of communication is the RTU (Remote
Terminal Unit) using hexadecimal characters of at
least 8 bits.
Address
protocol, transmis- NB:
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When selecting slave address 0, a message is sent to
all the instruments present on the network (only for
functions 6 and 16).
DIRIS A20 - RS485 - JBUS/MODBUS
Data CRC 16
Area available
0x01 / 0x02 / 0x04 / 0x08
0x01 / 0x02 / 0x04
0x10 / 0x20
0x20 / 0x40 / 0x100
0x01 / 0x02
0x01 / 0x02
DIRIS A20 - Réf. : 536 085 C
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GB
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