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15. COMMUNICATION FUNCTIONS
15.3 Protocol
POINT
Whether station number setting will be made or not must be selected if
the RS-232C communication function is used. Note that choosing "no
station numbers" in parameter No. 57 will make the communication
protocol free of station numbers.
Since up to 32 axes may be connected to the bus, add a station number or group to the command, data
No., etc. to determine the destination servo amplifier of data communication. Set the station number to
each servo amplifier using the parameter and set the group to each station using the communication
command. Transmission data is valid for the servo amplifier of the specified station number or group.
When "
*
" is set as the station number added to the transmission data, the transmission data is made
valid for all servo amplifiers connected. However, when return data is required from the servo amplifier
in response to the transmission data, set "0" to the station number of the servo amplifier which must
provide the return data.
(1) Transmission of data from the controller to the servo
S
O
H
S
T
X
E
T
X
S
T
X
E
T
X
Data
No.
Data*
Check
sum
10 frames (data)
Station number
or
group
Error code
Check
sum
6 frames
Positive response: Error code A
Negative response: Error code other than A
Servo side
(Slave station)
Controller side
(Master station)
Command
Station number
or
group
(2) Transmission of data request from the controller to the servo
S
O
H
S
T
X
E
T
X
S
T
X
E
T
X
Controller side
(Master station)
Servo side
(Slave station)
10 frames
Command
Data
No.
Check
sum
Error code
Data*
Check
sum
6 frames
(
data
)
Station number
or
group
Station number
or
group