User's Manual

Page 49
E Series Ethernet Radio – User Manual
Version 08-10
Part I – TVIEW+ Management Suite - Programmer
Settings
This menu permits selection of the PC serial port (COM1 to
COM16 if available) to be used for communications with the
unit. COM1 is the default selection and if a different port is to be
used it must be set before establishing a session by reading the
conguration from a unit. Whilst a session is established with a
unit this menu can not be accessed.
Help
The Help buttons within the Programmer will automatically take
you to section within the user manual when you click it.
Ethernet Port Conguration
The E Series Ethernet radios have the option to manually congure
your IP parameters (Static) or have the unit obtain IP information
automatically (DHCP).
Static IP conguration - Once Static has been selected, you can
manually congure your IP parameters.
IP Address: your IP address gives your radio a host/network
interface identication and network location address. This will allow
Ethernet Data packets to be delivered to specic nodes within your
network.
Net-Mask: Net-Masking allows you to break your net work up
into smaller realms that may use existing address space more
efciently, and, when physically separated, may prevent excessive
rates of Ethernet packet collision in a larger network.
Gateway: The Gateway is the node within your network, typically
a router, that your unit will send data to when the destination of an
Ethernet Packet falls outside of the units Net-Mask.
Data Port Conguration
Data from this user ports is multiplexed for transmission over the
air. The Data Port can be congured separately for the Character
layer (Data speed, number of data bits, number of stop bits, parity),
Packet layer and Handshaking (ow control). The Data Port must
be enabled if required. You can do this by setting the check box at
the top of its conguration section.
Character Layer
There are two standard formats and a custom format that can be
selected by checking the appropriate control button to the left of
the description. The standard formats are:
• 9600,N,8,1 (data speed = 9600 bps, no parity, 8 data bits, 1
stop bit)
• 4800,N,8,1 (data speed = 4800 bps, no parity, 8 data bits, 1
stop bit)
A non-standard format can be selected via the Custom button that
displays a dialogue box to permit selection of data speed, parity,
number of data bits and stop bits. Once selected the OK button
should be used to complete the selection. The custom selection
is also displayed in the main window below the Custom button.
Packet Layer
There are two standard congurations and a custom
conguration which can be selected by checking the appropriate
control button to the left of the description. There are essentially
two basic modes of operation for the packet assembler and
disassembler (PAD).
The rst is where the PAD operates in a standard mode with data
received at the port being immediately sent over the radio channel.
The second is a store and forward or delayed mode where whole
data packets are received from the port before being sent over the
radio channel.
In both cases data is sent over the radio channel in variable length
frames and delineation of these frames is dependent on the
conguration selected as well as the characteristics of the data
stream received at the data port.
The packet layer conguration options which can be selected are:
Standard (live framing)
With standard live framing data received from the host by the
modem is immediately placed into a frame and transferred onto
the radio channel. This minimises “store and forward” delays in the
data transmission.
If a stream of characters is received by the modem, then several
characters at a time may be placed into the same frame. The
number of characters in the frame depends mainly on the
respective baud rates of the user port and the primary channel
baud rate of the modem, as well as the level of overheads
experienced on the radio channel and the user data stream.
The number of data bits associated with the user data stream will
also have an effect on the average size of a frame. For instance
the number of stop bits, and number of data bits per character.
The system designer must choose the best compromise of all
the above items to ensure the most efcient method of data
transmission.
Note: The rst few characters are always packetised and sent by
itself regardless of all the above variables.