1) Why Batching

MC protocol supports batch read/write. For a large number of points, if requested point by point:

• Many round trips, low throughput
• High scheduling overhead and network overhead

The driver uses a planner in collection and write paths to merge multiple points into fewer batch requests.

2) maxPointsPerBatch

Meaning: Upper limit of logical points allowed to be merged in one batch (Actual meaning for word/bit is decided by protocol layer planning).

Suggestion:

• Keep default if unsure (Usually consistent with typical limit of the series)
• Can be increased when there are very many points, but do not exceed maximum value allowed by PLC/Protocol

3) maxBytesPerFrame

Meaning: Single frame payload byte limit, used to avoid constructing overly large request/response causing failure or affecting latency.

Suggestion:

• Default 4096 is usually a reasonable starting point
• Appropriately decrease if network quality is average or device processing is slow

4) concurrentRequests

Meaning: Number of concurrent in-flight requests allowed on the same connection.

Driver default is 1 (Strongest determinism), increasing concurrency may improve throughput, but risks include:

• Device/Gateway does not support concurrency leading to out-of-order response or error
• Increase instantaneous load and packet loss probability

Suggestion:

• Run stable with 1 first, then gradually increase in stress test environment (e.g., 2→4), observe error rate and average response time.

5) Relationship with PLC Series

Different series have different batch limits (Driver has built-in maximum values corresponding to series), therefore:

• Series must be correct, otherwise you might configure batch parameters that "seem usable but actually exceed limit"