B&B Electronics VESR321_ML_SL - Manual - Manual (Page 26)

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Serial Interface Modes
Four serial interface modes of operation are:
RS-232 - Point-to-point serial communications connection used by PC COM ports and many other
systems. Capable of baud rates up to 230.4 kbaud over short distances (typically 50 feet). Uses the DB-9
connector.
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.
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.
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.
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
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.
Server Serial Port Number
The Server Serial Port Number of the currently selected port is shown in this field.
VESR321 serial servers feature one DB9M connector for RS-232 and a five-position removable
terminal block for RS-422 and RS-485 connections.
Serial Watchdog
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.
Subnet Mask
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