Packet Trace: Control Mode Setting

This document details how to control the pump mode and setpoint (e.g., set constant pressure to 1.5m).

Overview

Control operations use Class 10 SET commands. - Sub ID: 0x5600 (Control) - Obj ID: 0x0601 (Setpoint/Mode Setting)

1. Set Mode and Setpoint

Setting a mode involves two steps: 1. Setting the Control Mode (Obj 0x0601 with mode-specific payload) 2. Setting the Setpoint value (Obj 0x0601 with float32 value)

Step 1: Set Control Mode

Payload format: 2F 01 00 00 07 00 [Flag] [ModeByte] [Suffix(4)] - Flag: 0x00 (Run/Start), 0x01 (Stop) - ModeByte: 0x00 (Pressure), 0x02 (Speed), 0x08 (Flow), 0x19 (DHW), 0x1B (Temp)

Example: Set Constant Pressure Mode

27 14 E7 F8 0A 90 56 00 06 01 2F 01 00 00 07 00 00 00 45 65 70 00 [CRC]

Step 2: Set Setpoint

Example: Set Constant Pressure to 1.5 meters 1. Convert meters to Pascals: 1.5 m * 9806.65 ≈ 14710.0 Pa 2. Encode as Float (Big-Endian): 14710.0 -> 0x46 65 D7 E6

Packet:

27 0C E7 F8 0A 88 56 00 06 01 46 65 D7 E6 [CRC]

Step 3: Receive Acknowledgment

The pump responds with a Class 10 acknowledgment.

24 08 20 E7 0A 34 56 00 06 01 [CRC]

Breakdown: - 24: Response - 34: OpSpec (SET Response) - 56 00: Sub ID - 06 01: Obj ID - No error bits set in OpSpec

4. Control Mode Identifiers

The ModeByte and Suffix are used in Step 1 to select the operating mode.

Mode	ModeByte	Suffix
Constant Pressure	`0x00`	`45 65 70 00`
Constant Speed	`0x02`	`45 65 70 00`
Constant Flow	`0x08`	`45 65 70 00`
DHW Cycle Time	`0x19`	`38 C6 76 EF`
Temperature Range	`0x1B`	`39 67 70 00`

5. Transaction Locking

Critical: Because the pump processes one command at a time, you must ensure no other commands are sent while waiting for the ACK.

async with transaction_lock:
    await send_packet(set_mode_packet)
    await receive_ack()