socomec ATyS 6m Notice D'utilisation page 111

Communication module
PROTOCOL JBUS / MODBUS
The JBUS / MODBUS ® used by the ATyS involves a
dialogue using a master-slave hierarchical structure.
There are two possible dialogues:
• the master communicates with a slave (ATyS) and waits
for its reply
• the master communicates with all the slaves (ATyS)
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
sion time must be less than 3 silences, i.e. the emission
time of 3 characters so that the message is processed
by the ATyS.
The standard communications frame consists of:
Slave address
• Slave address: communicating device address (Add,
menu Comm parameters)
• Function codes:
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).
• Address: concerned variable address (refer to following
tables)
• Values: parameters linked to function (number of
words, value).
SOCOMEC - Réf. : 532 211 F
®
® protocol, transmis-
Function code
Automatic Transfer Switch ATyS
Address Data
• NB:
When selecting slave address 0, a message is sent to all
the instruments present on the network (only for func-
tions 6 and 16).
• Comment:
The response time (time out question/answer) is 250 ms
maximum.
OPTIONS
CRC 16
111