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COM Port Configuration
The COM Port Configuration is used to configure the parameters for Modbus communication
connection between the MDC-700 and Modbus RTU slave devices.
NOTE
Only one set of configuration settings is allowed for each COM port.
The connection configuration for a COM port consists of 8 parameters defined as follows.
ComPortNo
Specifies the COM port number in MDC module. The COM port number can be
1 or 2 for MDC-711, 1 ~ 5 for MDC-714 and MDC-741 and so on.
BaudRate
Defines the transmission speed between the MDC module and the RTU slave
devices. The BaudRate can be set to 1200/ 2400/ 4800/ 9600/ 19200/ 34800/
57600/ 115200 (bps) depending on the RTU slave device being used.
DataBit
Defines the number of data bits in each character. It is fixed to 8 and the RTU
slave devices need be set to 8-bit data, too.
Parity
Defines the Parity bit. The parity bit can be set to 0 (none), 1 (even) or 2 (odd).
StopBit
Defines the Stop bits.
The stop bit can be set to 1 (1 stop bit) or 2 (2 stop bits).
Timeout
Defines the period of time that the MDC module will wait for a response from the
RTU slave device. The available range is from 50 to 6000 (ms).
PollDelay
Defines the Poll Delay between each scan for Modbus RTU communication.
The available range is from 20 to 6000 (ms).
OperatingMode
Defines the operating mode.
- Master: the com port is used to connect Modbus RTU slave devices.
The MDC-700 is acting as a master to send requests to slave devices.
- Slave: the com port is used to connect Modbus RTU master devices.
The master devices can read/write data from/to the MDC-700.
# ComPortNo
BaudRate DataBit Parity StopBit Timeout PollDelay OperatingMode
*
1
115200
8
0
1
100
20
Master
*
2
115200
8
0
1
100
20
Master
*
3
115200
8
0
1
100
20
Master
*
4
115200
8
0
1
100
20
Master
*
5
115200
8
0
1
100
20
Master
