CALAMP WIRELESS NETWORKS INC. MCUC5 ユーザーズマニュアル
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16
Integra T Technical Manual
signal strength), seriously disrupting network
operation.
operation.
The Tx Timeout is fixed at 30 seconds, and may
be enabled or disabled using the Integra-T RSS.
When active, the Tx Timeout disables the
transmitter. The timer can be reset by cycling
RTS off and back on again. In DOX mode the
timer will reset at the next break in the data
stream that exceeds the value set for the Data
Forwarding Timer. In either case, a new trans-
mission may begin immediately.
be enabled or disabled using the Integra-T RSS.
When active, the Tx Timeout disables the
transmitter. The timer can be reset by cycling
RTS off and back on again. In DOX mode the
timer will reset at the next break in the data
stream that exceeds the value set for the Data
Forwarding Timer. In either case, a new trans-
mission may begin immediately.
If your application software may occasionally
output data for longer than 30 seconds, the TX
TIMEOUT timer may be disabled. Warning:
Transmissions longer than 30 seconds may
exceed the duty cycle rating of the transmit-
ter and lead to shortened life or transmitter
failure.
output data for longer than 30 seconds, the TX
TIMEOUT timer may be disabled. Warning:
Transmissions longer than 30 seconds may
exceed the duty cycle rating of the transmit-
ter and lead to shortened life or transmitter
failure.
2.10 Optimizing Your System
Detailed system engineering is beyond the scope
of this manual. However, there are some simple
tips that can be used to optimize performance of
a radio based SCADA or telemetry system.
of this manual. However, there are some simple
tips that can be used to optimize performance of
a radio based SCADA or telemetry system.
Choose the best protocol. Some SCADA de-
vices allow a choice of more than one operating
protocol. In some cases, performance can be
improved by selecting a different protocol. Your
sales representative can advise you for many
common types of equipment, or a simple trial
and error process can be used to select the one
that performs best.
vices allow a choice of more than one operating
protocol. In some cases, performance can be
improved by selecting a different protocol. Your
sales representative can advise you for many
common types of equipment, or a simple trial
and error process can be used to select the one
that performs best.
Check timer settings. Polling protocols issue a
poll, then wait a certain time for a response. The
Integra-T adds a short amount of delay to each
poll and response (typically in the order of 60 to
70 ms). Timer settings that are too short may
cause erroneous indication of missed polls, in
which case the application may retry or continue
to cycle, ignoring the missed station. In this
case, the response may collide with the next
poll, further increasing errors. Setting an ade-
quate timer margin will avoid problems and
maximize performance.
poll, then wait a certain time for a response. The
Integra-T adds a short amount of delay to each
poll and response (typically in the order of 60 to
70 ms). Timer settings that are too short may
cause erroneous indication of missed polls, in
which case the application may retry or continue
to cycle, ignoring the missed station. In this
case, the response may collide with the next
poll, further increasing errors. Setting an ade-
quate timer margin will avoid problems and
maximize performance.
Avoid flow control. Set the COM port baud rate
to a value less than or equal to the radio network
baud rate (4800 or 9600 b/s). In a polling sys-
tem, this will prevent buffer overflow with pos-
sible missed transmissions. If the port baud rate
must be set higher than the radio network baud
rate, you may have to limit message length to
prevent possible buffer overflow. The Integra-T
will always exert a flow control signal (CTS
dropped) if buffers are almost full, but not all
DTE honor such signals.
to a value less than or equal to the radio network
baud rate (4800 or 9600 b/s). In a polling sys-
tem, this will prevent buffer overflow with pos-
sible missed transmissions. If the port baud rate
must be set higher than the radio network baud
rate, you may have to limit message length to
prevent possible buffer overflow. The Integra-T
will always exert a flow control signal (CTS
dropped) if buffers are almost full, but not all
DTE honor such signals.
Use the highest suitable port baud rate, without
exceeding the radio network baud rate. Operat-
ing an RTU at 1200 b/s on a 9600 b/s network
will increase data transmission delays and re-
duce system performance.
exceeding the radio network baud rate. Operat-
ing an RTU at 1200 b/s on a 9600 b/s network
will increase data transmission delays and re-
duce system performance.
Evaluate the need for online diagnostics. Ena-
bling online diagnostics increases delays by 5 to
10 ms (depending on speed). In critical appli-
cations, this extra delay can be eliminated by
disabling online diagnostics. Offline diagnostics
(diagnostics on request) remain available.
bling online diagnostics increases delays by 5 to
10 ms (depending on speed). In critical appli-
cations, this extra delay can be eliminated by
disabling online diagnostics. Offline diagnostics
(diagnostics on request) remain available.