Cal Amp VIPER SC+ 100 series User Manual - page 53
Viper SC+™ IP Router for Licensed Spectrum PN 001-5008-000 Rev. C
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Note: It is the user’s responsibility of the user to check his or her FCC license or applicable regulatory agency for the
country or geographical area in which the Viper will be operated to determine the correct parameters and settings for
the channel frequencies, power level and bandwidth. Selecting a frequency range or transmit power that is out of
compliance (in the country where used) could void the user’s authority to operate the equipment.
Settings
Transmitter
The Viper radio transmitter can be enabled or disabled. The factory default setting is Disabled, to disable the radio
transmitter until the Viper is minimally configured. (Until the Setup Wizard is successfully completed.)
Channel Number
When the Viper Transmitter is Enabled, you may select a channel number. The number of channels available for
selection depends on Frequency Range and Bandwidth. Viper supports up to 32 different frequency channel pairs.
Tx Frequency (MHz), RX Frequency (MHz), and Tx Power
The Viper can operate in simplex (same Tx and Rx frequency) or half-duplex (Tx and Rx frequencies are different)
mode. All Vipers in a radio network must be set the same. The Tx Power setting allows you to increase or decrease
the transmit power as required.
Bandwidth (kHz), Data Packet Bit Rate (kbps), and Control Packet Bit Rate (kbps)
These settings are computed from the Channel size and frequency range.
Carrier Sense Level Threshold (dBm)
The threshold Viper uses to determine whether a received RF signal is a valid message or unwanted noise. If RF
level above the threshold is detected, the Viper will not transmit data. Signals are received and decoded. Outgoing
data is buffered until the channel becomes available. Threshold may be raised to prevent false detection in radio-
noisy environments or lowered to gain extra receive sensitivity. Lower thresholds should only be used when
ambient RF noise is very low. Receive sensitivity depends on the channel bandwidth and speed being used. Refer
to Specifications for the Carrier sense by model. The default setting is -110 dBm.
Listen Before Transmit
The Viper can be configured to listen on the Rx frequency and determines if the RF channel is available. The
channel is available as long as the received level is lower than the carrier sense threshold. When the channel is
busy, Viper receives and decodes all remote messages. Outgoing data is buffered and sent when the channel
becomes available. The default setting is Enabled (listen to data only).
Three options are available for Listen Before Transmit.
Enabled (listen to noise and data)
Enabled (listen to data only)
Disabled
These are explained below.
Enabled (listen to noise and data)
In this mode of operation, the Viper acts as a TCP server. It can accept up to 256 TCP connections from remote
endpoints. Data received from any remote endpoint is sent over the serial port. Data received from the serial
port is sent to every endpoint connected to the TCP server.
Received level is above the carrier sense threshold if:
The Viper is receiving valid data,