B&B VESR901, Руководство пользователя

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for connections and set the maximum (up to four) number of simultaneous
connections it will accept. You can filter the connections it will accept based on
specific IP addresses or ranges of IP addresses that you specify.
PASSWORD
When you first receive the VESR9xx serial server from the factory the
Password is
blank so that you can initially access the serial server without entering a value into
this field. To ensure security you should create and save a password the first time
you configure the serial server. After a password has been set up it must be entered
each time you login to Vlinx Manager. The password is used to access the
configuration pages from the Vlinx Manager Login page and can be changed from the
General page.
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 115.2 kbaud over short distances
(typically 50 feet). Typically uses DB-9 connectors but terminals are also used on
VESR9xx 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
VESR9xx 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 VESR9xx 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 VESR9xx 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.