VESR424D Serial Server
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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, the serial server 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 will default 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.
The
Firmware Version
number (Vx.x.x) indicates the serial server's currently loaded firmware
release. From time to time new firmware is made available and can be uploaded into the serial
server using Vlinx Manager.
Flow Control
determines the type of handshaking that is used to control sending and receiving
of messages. Options include No Flow Control, Hardware Flow Control (RTS/CTS) and
Software Flow Control (XON/XOFF). The Flow Control setting must match the requirements of
the serial device connected.
NOTE: Select No Flow Control when setting the port as RS-422 or RS-485 4-wire.
Forced Transmit
controls the maximum amount of time that characters can be buffered before
sending the characters to the network. Larger values decrease the number of network packets,
but increase the amount of time to receive characters. Smaller values increase the number of