M Series AC Servo
User Manual
147
Rev. 1.0
7/31/2019
400-820-9661
9.3.2 Communication Address
In the network system, each drive requires a unique drive address. Only the drive with the matching
address will responded to the host command. In ModBUS network, address
“
0
”
is the broadcast address.
It cannot be used for individual drive
’
s address. ModBUS RTU/ASCII can set drive address from 1 to 31.
9.3.3 Communication Baud Rate And Framing
M2 series AC servo drive has a fixed communication data framing: 8,N,1. Date bits:8, parity checking:
none, stop bit: 1.
Parameter P-77 (BR) defines the communication baud rate.
In serial communication, the change of baudrate will NOT effect immediately, it will ONLY effects at next
power up of the drive.
1 = 9600bps
2 = 19200bps
3 = 38400bps
4 = 57600bps
5 = 115200bps
9.3.4 Power Up Mode
Parameter P-14 (PM) sets the power up mode for the drive. For current M2 servo drives, these are the
power up mode:
8 = Modbus/RTU mode when powered up.
9 = Q mode with Modbus/RTU communication, when powered up.
9.3.5 Modbus/RTU Data Framing
ModBUS RTU is a master and slave communication system. The CRC checking code includes from
drive
’
s address bits to data bits. This standard data framing are as follows:
Address Function Data CRC
based on data transfer status, there can be two types of response code:
Normal ModBUS response:
response function code = request function code
ModBUS error response:
response function code = request function code + 0x80
providing an error code to indicate the error reasoning.
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