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DIRIS A20
- Réf. : 536 085 C
DIRIS A20
- RS485 - JBUS/MODBUS
®
prOGraMMING
COMMuNICatION StOp BIt
>
Example : stop = 2
x 1
x 1
(2 bits)
x 2
(1 bit)
x 1
confirm
33
DIRIS A20
- Réf. : 536 085 C
DIRIS A20
- RS485 - JBUS/MODBUS
®
GB
The JBUS/MODBUS
®
used by the
DIRIS A20
involves
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 mode of communication is the RTU (Remote
Terminal Unit) using hexadecimal characters of at
least 8 bits.
According to the JBUS/MODBUS
®
protocol, transmis-
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).
NB:
When selecting slave address 0, a message is sent to
all the instruments present on the network (only for
functions 6 and 16).
the StaNdard COMMuNICatIONS fraMe
Slave address
Function code
Address
Data
CRC 16
DIRIS A20
- RS485 - JBUS/MODBUS
®
COMMuNICatION
The standard communications frame consists of:
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
Area available
C550
C550 Hex : Metrology with CT/VT Affected
0x01 / 0x02 / 0x04 / 0x08
C650
C650 Hex : Energy
0x01 / 0x02 / 0x04
C750
C750 Hex : Statistics
0x10 / 0x20
C850
C850 Hex : Metrology W No CT/VT Affected
0x20 / 0x40 / 0x100
C950 Hex
C950 Hex : Harmonics
0x01 / 0x02
E000
E000 Hex : Setup
0x01 / 0x02
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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