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drive.web
Modbus RTU Master
Comms Port
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| Comms Port Function Block | Each Modbus RTU Master will have one Comms Port function block which provides global serial port configuration, control, and monitoring. |
| SFD Level |  |
| Internals |  |
| Comms Speed | The communications rate for the serial connection in bits per second (b/s). The Comms Speed can be set between 300 b/s to 115.2 kb/s. For proper operation, the Comms Speed must match the slave device's settings. |
| Comms Configuration | The character framing for the serial connection in the format data bits-parity-stop bits. Supported character framing is: 8-N-1, 8-O-1, 8-E-1, and 8-N-2 (where N=no parity, E=even parity, O=odd parity). |
| Actual Polling Period | The time required to complete a poll of all parameters acquired via the serial connection. The period is directly affected by the number of parameters polled, comms errors, comms timeouts, and the comms sleep time. |
| Comms Timeout | The time the master is to wait for a reply before moving to the next parameter in the polling cycle (Range=0 to 30000 ms). Adjust appropriately for the application and the slave devices attached. |
| Comms Sleep Time | The time delay between the end of the previous and the start of the next polling cycle. May be adjusted to limit microprocessor loading of the drive.web or slave device if serial link update performance is not a critical factor. |
| Status | The overall status of the comms link incorporating the status of all of the Last Errors of all the individual INT16 and UINT16 Holding Register function blocks. All individual Last Error codes can be cleared by clicking on this parameter and using the Reset pushbutton. |
| Enable | A global enable/disable parameter controlling serial communications through the EIA-485 port. When disabled, all polling is suspended. |