BB-VESP211x Serial Servers
:
46
Delimiter 1, Delimiter 2 and Delimiter Removal
.
Delimiters and Delimiter Removal enable you to
control how characters received on a serial port are sent across the network. Delimiters are ASCII
characters specified by the user when configuring the serial server. The serial server takes action when it
recognizes the specified character(s) on its serial port.
x
Delimiter 1
is a
start delimiter.
The range of ASCII values is 1 through 255.
x
Delimiter 2
is an
end delimiter
. The range of ASCII values is 1 through 255.
x
Delimiter Removal
controls removing of Delimiter 1 and Delimiter 2 from the received
characters before the received characters are sent to the network.
How Delimiters Work.
When only Delimiter 2 (the end delimiter) is enabled, characters received
by the serial port are accumulated in a buffer. When the end delimiter is received on the serial
port, the buffered characters, including the end delimiter, are sent to the network. All characters
received after the end delimiter are again buffered until another end delimiter is received.
When both Delimiter 1 (start delimiter) and Delimiter 2 (end delimiter) are enabled, characters
received by the serial port will be discarded until the start delimiter character is detected on the
serial port. The serial server then buffers the start delimiter character and all subsequent
characters received after it until the end delimiter is detected. When the end delimiter is received,
the buffered characters, including the start and end delimiters, are sent to the network.
When Delimiter Removal is enabled it removes the delimiter character(s) before sending the
other characters across the network.
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 serial server, on power up it sends a DHCP request to the DHCP server,
which assigns a dynamic IP address, subnet mask, and default gateway to the serial server.
When DHCP is disabled (static IP addressing), the IP Address, Subnet Mask 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.
Note 1: This product is factory defaulted to DHCP mode. It is intended that your network’s DHCP Server provide the
IP address assignment. If there is not a DHCP server on your network, the device defaults to IP address
169.254.102.39.
Note 2: 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 serial server is configured to
communicate with a specific IP address of the serial server, and the IP address has been changed, the device
will not be able to communicate with the serial server.
Firmware Version
number (Vx.x.x) indicates the serial server's currently loaded firmware release. From
time to time new firmware is available and can be uploaded into the serial server using Vlinx Manager.