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57 lines
3.2 KiB
Plaintext
57 lines
3.2 KiB
Plaintext
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<meta name="generator" content="HTML Tidy for HTML5 for Apple macOS version 5.8.0">
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<title>JMRI: Monitor Maple Traffic</title>
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<meta name="author" content="Bob Jacobsen">
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<meta name="keywords" content="JMRI help monitor maple traffic message packet">
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<h2>Monitor Maple Traffic</h2>
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<p>This window allows you to monitor communication between your Maple panels and your
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computer, so you can see what is happening as JMRI sends information to and receives
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information from your Maple System. You can save this information to a log file for
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troubleshooting purposes.</p>
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<p><strong>Background Information:</strong> On Maple, the coil bits in the Maple HMI's are
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used to communicate with JMRI. In this Maple-to-JMRI implementation, all panels use the same
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address space and have exactly the same input and output bit assignments. The first 1000 coil
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bits are reserved for configuration as Sensors. Sensors are referred to as "Input Bits" and
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are used to set JMRI Sensors according to status bits in your Maple HMI panels. Therefore,
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Sensors pass information from configured HMI panels to JMRI. The next 8000 bits are reserved
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for assignment as "Output Bits" and are used to send the current settings of Turnouts and
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Lights to the Maple Panels.</p>
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Maple communications work by polling. Each panel is polled separately, and the results of the
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polls are ORed together to set Sensors. Therefore if a Sensor is ACTIVE (Maple "1") in any
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panel, it is set ACTIVE. If a Sensor is INACTIVE (Maple "0") in all configured panels, then
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it is set INACTIVE. The panels are polled in the order that they are configured.
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<strong>Note:</strong> The Maple poll command only allows a maximum of 99 bits to be read
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with each poll command, so if more than 99 input bits are configured, you will see multiple
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poll commands for each panel.
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<p>After all panels have been polled, the status of output bits is sent to the panels. Output
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bits are sent in "Broadcast Mode" so all panels can receive the bits at the same time.
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Broadcast Mode is indicated by an HMI Station Address of "0". Output bits begin with HMI coil
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bit address of "1001". All configured output bits are sent, regardless of if the bit is
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assigned or not. <strong>Note:</strong> The Maple write command only allows a maximum of 99
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bits to be written with each transmit command, so if more than 99 output bits are configured,
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you will see multiple transmit commands, with starting addresses increasing by 99 in
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each.</p>
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<p>For more information on the various controls and options at the bottom of this window,
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please see the <a href="../../AbstractMonFrame.shtml">Communications Monitor Window
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page</a>.</p>
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