---
url: >-
  https://acquirer-api-docs-v4-en.pingpongx.com/notes/zh/api/services/InPersonPayments/gmc/heartbeat/index.md
description: 'GMC串口心跳接口用于保持SAAS与POS设备之间的连接状态。建议每30秒发送一次心跳包,连续3次无响应可判定设备离线。bizContent字段可为空。'
---
# GMC串口心跳接口

```apidef
endpoint: POST /onsiteAcquirer/gmc/heartbeat
name: GMC串口心跳接口
```

GMC串口心跳接口用于保持SAAS与POS设备之间的连接状态。建议每30秒发送一次心跳包,连续3次无响应可判定设备离线。bizContent字段可为空。

### 请求示例

```json
{
  "accId": "PPX_ACC_202312001",
  "clientId": "PPX_MCH_20230001",
  "signType": "SHA256",
  "sign": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
  "version": "1.0",
  "event": "HEARTBEAT",
  "requestTime": "1683533500000"
}
```