ElmoMC Multi-Axis Motion Controller-Maestro - Manual (Page 230)

Maestro Software Manual Ethernet/IP Communication
MAN-MASSW (Ver. Q)
12-10
8. int retVal = readInputRegisters(int startAddress, ,::iStaticArray,
int num)
MODBUS function code 04. Read the contents of the input registers (3:00000
table). Up to 125 registers.
Parameters:
startAddress – start register address(range: 1 - 65536)
iStaticArray – static integer array which will contain the data read
num - number of registers to be read (range: 1-125)
Returns: 0 on success or error code.
Example:
masterObj.readInputRegisters(1::iStaticArray,10)
12.4 Slave (Server) functionality implementation
The MODBUS Slave implements the Server Engines for each MODBUS slave protocol
flavor. The MODBUS Slave can have one of following types (Figure 12-3):
Figure 12-3: MODBUS Slave types
• TCP communication
Parameters:
o
MODBUS address (view paragraph 1.1)
o
Port (view paragraph 1.1, 502 – default port value)
• RTU over Serial communication
Parameters:
o
MODBUS address (view paragraph 1.1)
o
Serial port
Serial port identifier (default port value "COM1", for information only)
o
Baud rate
Port baud rate in bps (typically 38400)
o
Data bits
Port data bits (for RTU Must be SER_DATABITS_8)
o
Stop bits
Port stop bits
o
Parity
Port parity: no parity, odd parity or even parity