Polling mode (acknowledged)
Polling mode (acknowledged) and Polling mode (basic) operate in the same way. The difference between the two modes is in their means of achieving the reliable delivery of data. In Polling mode (acknowledged), the firmware achieves reliable delivery using retries and acknowledgments.
| Characteristics |
Uses a high percentage of available network bandwidth. Eliminates collisions. Works with reliable delivery (RR or MT parameters). Supports binary data transfers. Base device requests packets from remote device by polling a sequential range of addresses. Base device is configured to specify the range of addresses being polled. Uses inter-character delay to create RF packet lengths aligned with protocol packet lengths up to 2048 bytes long. |
| Constraints |
The minimum time interval between polling cycles is configurable. However, if the remote devices cannot all be processed within that time interval, the polling cycle is ineffective (i.e. it will impose no additional delay). In order to ensure a pause between polling cycles, PD must be set to a value which is large enough to accommodate the pause. |
| Recommended use |
Use for point-to-multipoint applications that require Reliable Delivery of data. Use this mode when it is critical that a base device be able to discern data coming from multiple devices. |
| Required parameter values (Base) |
MD (RF Mode) = 3, PB (Polling Begin Address) PE (Polling End Address) |
| Required parameter values (Remote) |
MD (RF Mode) = 4
|
| Related commands |
Networking (RR, PD, DT, MY) |
For configuration and theory of operation information, see Polling mode theory of operation, Configure a Polling Base and Configure a Polling Remote.
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