B&B Electronics Vlinx VESP211, Manual

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Section 8 - Description of Serial Server Properties Vlinx VESR4x4 Serial Server
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kbaud over short distances (typically 50 feet). Typically uses DB-9
connectors but terminals are also used on VESP211 serial servers.
 RS-422 - Point-to-point communications using a transmit pair and a
receive pair. RS-422 can operate at higher speeds and longer distances
than RS-232. Typically uses two shielded twisted pairs and screw
terminals but DB-9 connectors are also used on VESP211 serial servers.
 RS-485 2-wire - Similar speed and distance specifications as RS-422
but allows multidrop connections. Typically uses one shielded twisted pair
and screw terminals but DB-9 connectors are also used on VESP211
serial servers.
 RS-485 4-wire - Similar speed and distance specifications as RS-422
but allows full-duplex connections. Typically uses two shielded twisted
pairs and screw terminals but DB-9 connectors are also used on VESP211
serial servers..
Select the appropriate serial interface mode for the type of connection
between the serial server's serial port and the device connected to it.
Note: Refer to the Appendix D for connector and pin-out details.
Serial Server Name is a unique name assigned to the serial server. It must
be a valid hostname as defined by RFC-952 and RFC-1123. The rules are:
 It must consist only of the characters "A" to "Z", "a" to "z", "0" to "9" or
"-"
 It can start or end with a letter or a number, but it must not start or end
with a "-".
 It must not consist of all numeric values.
The Server Serial Port Number of the currently selected port is shown in
this field. For more information refer to the TCP/UDP Ports table in Appendix
B, which shows the ports used for several modes of operation.
Serial Watchdog controls the duration of serial inactivity when the serial port
is determined idle and causes all connections for that serial port to be forced
closed. The range is 1 through 65535 milliseconds.
The Subnet Mask specifies the network mask the serial server uses when on
a subnetted network.
 For a Class A network (IP addresses 0.0.0.0 through 127.255.255.255)
the default subnet mask is 255.0.0.0.
 For a Class B network (IP addresses 128.0.0.0 through 191.255.255.255)
the default subnet mask is 255.255.0.0
 For a Class C network (IP addresses 192.0.0.0 through 233.255.255.255)
the default subnet mask is 255.255.255.0