BB-VESP211x Serial Servers
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51
Serial Interface Modes.
Four serial interface modes of operation are:
x
RS-232
- Point-to-point serial communications connection used by PC COM ports and many
other systems. Capable of baud rates up to 115.2 kbaud over short distances (typically 50 feet).
Typically uses DB-9 connectors but terminals are also used on BB-VESP211 serial servers.
x
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 BB-VESP211 serial
servers.
x
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 DB9 connectors
are also used on BB-VESP211 serial servers.
x
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 DB9 connectors
are also used on BB-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:
x
It must consist only of the characters "A" to "Z", "a" to "z", "0" to "9" or "-"
x
It can start or end with a letter or a number, but it must not start or end with a "-".
x
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.
x
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.
x
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
x
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