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Modbus Master C# Source Code Library
Users Manual
Sl. No. Parameter Name Description
1
SlaveIPAddr
Network over which to open the
Modbus communication
2
IPPortNo
IP Port Number
Data Type
string
int
Return Value: byte - MBDEFS_TRUE: If initialisation successful
MBDEFS_FALSE: If initialisation fails
Here MBDEFS_TRUE = 1 and MBDEFS_FALSE = 0
7.3) MBSendRequest
Format: byte MBSendRequest(
byte SlaveNo, byte FunctionCode,
ushort VarAddress, ushort NItems,
ushort[] data, uint TimeOut,
byte Retries )
This function is used to send the request and receive the response from the Modbus
slave.
Parameters:
Sl. Parameter
No. Name
1
SlaveNo
Description
Slave ID from which data is to
be read
Data
Type
byte
2
FunctionCode Type of data to be requested
from the slave
byte
3
VarAddress
Starting variable address of the ushort
data to be read
4
NItems
No of items of the specified type ushort
to be read
5
data
Memory allocated data buffer for ushort
receiving the requested data
6
TimeOut
Time out in milliseconds for the
Read operation
uint
7
Retries
No of retries in case of
transmission failure
byte
Values
1 - 247
Supported list
given in Technical
Specification
section.
1 – 65535
**Number of Coils
/ DiscreteInputs / Registers.
Valid data buffer
with memory
allocated for
receiving ‘Items’
As decided by the
end user.
As decided by the
end user.
Return Value: byte - MBDEFS_TRUE: If initialisation successful
MBDEFS_FALSE: If initialisation fails
Here MBDEFS_TRUE = 1 and MBDEFS_FALSE = 0
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