CalAmp Integra-Tr, Руководство пользователя, Страница: 65 / 71

Integra-TR User Manual Page | 65
3.5 INTEGRA-TR HELP FILES
Integra-TR Field Programming Software’s online help files are accessed by the menu bar at the top of the Field
Programming window.
Figure 42 - Integra-TR Online Help Introductory Screen
3.6 OPTIMIZING YOUR SYST EM
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.
Choose the best protocol Some SCADA devices allow a choice of more than one operating protocol. In some cases,
performance can be improved by selecting a different protocol. Contact Technical Service for assistance.
Check timer settings Polling protocols issue a poll and wait a certain time for a response. Integra-TR 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 adequate 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 speed (2400, 4800, 9600
or 19200 b/s). In a polling system, this will prevent buffer overflow with possible missed transmissions. If the port baud rate
must be set higher than the radio network speed, you may have to limit message length to prevent possible buffer
overflow. Integra-TR will 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 speed) Operating an RTU at 1200 b/s on a
9600 b/s network will increase data transmission delays and reduce system performance.
Evaluate the need for online diagnostics Enabling online diagnostics increases delays by 2.5 to 20 ms (depending on
speed). In critical applications, this extra delay can be eliminated by disabling online diagnostics. Offline Diagnostics
(diagnostics on request) remain available.