B&B Electronics Vlinx MESR9xx - Manual (Page 26)

4. Properties Vlinx MESR9xx Modbus Gateway
Page 22 Manual Documentation Number MESR9xx-4508m
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Data/Parity/Stop
The number of Data bits, type of Parity and number of Stop bits selected define the
serial port parameters at which the Modbus gateway will operate. These parameters must
be configured to match the parameters set on the Modbus network connected to the
Modbus gateway's serial port.
Data Bits controls the number of bits of data in each character. Options include 5, 6, 7 or
8 data bits.
Parity controls the error checking mode. Options are No Parity, Odd, Even, Mark or
Space.
Stop Bits controls the number of bits to indicate the end of a character. Options include
1, 1.5 and 2. (1.5 bits is only valid when 5 data bits is selected, which is rare. The 2 stop
bits setting is only valid when 6, 7 or 8 data bits is selected.)
Default Gateway
The Default Gateway address sets the default route to remote networks, enabling users
to access the Modbus gateway from outside the local network.
DHCP
DHCP (Dynamic Host Configuration Protocol) is a protocol used on special servers
that supply IP addresses to network nodes on request.
When DHCP is enabled on the Modbus gateway (factory default), on power up it sends a
DHCP request to the DHCP server, which assigns a dynamic IP address, subnet mask,
and default server to the Modbus gateway.
When DHCP is disabled (static IP addressing), the IP Address, Subnet and Default
Gateway fields must be set manually by entering the appropriate addresses in these fields.
If you do not know what addresses to use in these fields, ask your network administrator.
Notes:
A dynamic address assigned by the DHCP server may change if the server loses the Ethernet
connection or power is removed. If a device on the network that normally communicates with the
Modbus gateway is configured to communicate with a specific IPaddress of the Modbus gateway,
and the IP address has been changed, the device will not be able to communicate with the Modbus
gateway. Therefore, disabling DHCP and using a static IP address is recommended.