# 通讯秤 WIFI 模块配置说明 (WiFi Module Setup Manual)

Canonical URL: https://ai.njwl.ai/cheng/
Source: 3656958705WIFI模块设置说明_v1.7最新.docx (v1.7), updated 2026-09-04.

## Critical facts

1. The scale's WiFi module only supports 2.4 GHz WiFi, not 5 GHz. Provisioning methods WiFi1 and WiFi2 support only WiFi4 / 2.4 GHz routers (most dual-band-combined routers also work).
2. To enter provisioning mode, press the composite key while the scale is in weighing state; the screen shows "WIFI" for about 1 second. Repeat this key press to cycle WiFi1 → WiFi2 → (WiFi3).
3. Composite keys vary by model (see the table in the page): e.g. 5-key scale = [功能/模式/Mode] + [单位]; 6-key = [重示/MR] + [单位]; 20-key counting = [累计清除] + [去皮]; 20-key pricing = [单位] + [去皮]; 28-key pricing = [PLU] + [单位]; calibration-key meter = [校正/CAL] + [单位].
4. Three provisioning methods: WiFi1 (in-app direct), WiFi2 (phone connects to the scale's "HCT-WiFi" hotspot), WiFi3 (app auto-discovers the scale).
5. Communication uses TCP. As a server, default Modbus port is 502; forbidden ports include 60000 and other restricted ports.
6. As an HTTP client, the scale posts to a server-provided API (default payload is a single weight; JSON + GBK default). As an HTTP server it supports GET only on port 80.
7. Heartbeat packets can be enabled to prevent disconnects; the server must echo the same heartbeat data.

## Provisioning composite-key table (key → key sequence)

- 5键计重秤/仪表/天平: [功能/模式/Mode] + [单位]
- 6键计重秤/仪表: [重示/MR] + [单位]
- 20键计数仪表: [累计清除] + [去皮]
- 28键计数仪表: [单重预设] + [单位]
- 20键计价仪表: [单位] + [去皮]
- 28键计价仪表: [PLU] + [单位]
- 带校正键的小仪表: [校正/CAL] + [单位]

## Communication settings

- Must press [一键读取] before changing parameters.
- Serial/baud rate must match the scale's serial port.
- Fixed IP is optional; when set, the IP must be accepted by the router and the gateway must be valid, otherwise later parameter setting will fail. Leave fixed IP unchecked for automatic IP.

## HTTP

- GET example (HTTP server mode): http://192.168.28/get (port 80, fixed).
- Optional command field `cmd` (e.g. `SZ` = tare-to-zero). Note: the returned data after a command is the PREVIOUS data, not the post-command result.

## Files

- Human-readable page: index.html
- Structured facts: facts.json
- Original document: files/3656958705WIFI模块设置说明_v1.7最新.docx
- Images: img/image1.png … img/image37.png (image2 is jpeg)