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E Series Ethernet Radio – User Manual
PTT Timeout
The PTT timeout facility is used to disable the transmitter if it
exceeds the designated time. The timeout value can range from 1
to 255 seconds and the facility is disabled by setting a zero value.
The timeout value chosen for this should be set according to
system requirements which may include:
•
Prevention of a remote unit remaining keyed up and locking
out all other remote units in a point to multipoint system.
•
Limiting the period a remote unit remains keyed up to
prevent battery drain in a low power application.
Note: If a PTT timeout occurs before completion of a data
transmission data will be lost.
Part I – TVIEW+ Management Suite - Programmer
Serial Port Stream Setup
This button brings up a dialogue box to permit editing of Stream
Identifier (SID) codes which are used by the modem as the
addressing mechanism for data stream routing. A SID code is
always placed at the start of each data frame as it is sent over the
radio channel. The receiving modems use this SID to determine
how to route the data message.
The following diagram illustrates the structure of the stream routing
function for each data port.
User Port
This option is selected by clicking on the User Port button and
filling in the RXSID and TXSID fields to the right. The radio comes
preconfigured with default values.
In User Port mode all SID code operations are performed
transparently to the user data. Data placed into a user port which
has been assigned a specified SID code, will only be received by
a modem at the other end of the radio link that has a user port
assigned with the same SID code. The SID code is added by the
radio modem to the user data stream and removed by the radio
modem when user data is outputted to the serial port.
Two SID codes values are available in user port mode RXSID and
TXSID. The RXSID codes apply to the data being received by the
modem, and the TXSID codes apply to the data being transmitted
by the modem. This allows for different transmit and receive codes
if required, but generally they would be both the same.
A situation where Tx and Rx SID codes may be different is in a
repeater configuration. In this type of application all data messages
sent to the repeater will be “repeated”. Thus by having different Tx
and Rx codes, a control unit will not “hear” its own transmission,
and remotes will not hear the reply from any other remote.
For more information please consult the Trio E Series training
material available as a power point slide from our website, www.
triodatacom.com
Ethernet Port Stream Setup
By default the Ethernet Stream Identifier Code (SID) is set to 250
and the Bridge SID for Downstream is only available when radio
mode parameter is set to Bridge.
The SID numeric is appended onto the front of each Ethernet
packet sent over the air. This allows receivers to filter wanted
messages apart from unwanted messages.
When a unit is in Bridge mode, the Bridge SID parameter will
become accessible. This allows you to control the direction of data
flow. The SID parameter should be configured to match you access
point’s SID (or upstream unit) and the Bridge SID parameter
should be configured to match you remote’s SID off that bridge or
Downstream unit.
