Hikvision ANPR (ISAPI) - Triggering Plate Recognition via API

I'm trying to integrate a Hikvision ANPR/LPR camera using ISAPI, but I can't find clear documentation on whether it's possible to trigger plate recognition manually instead of running it continuously.

Goal: I want the camera to recognize a plate only when I send an API request, not automatically.

Example:

1. I send an API request, e.g., GET/PUT /ISAPI/Traffic/channels/1/vehicle/tryPlateRecognise.
2. The camera attempts to recognize the plate.
3. It returns the detected plate number and confidence level. e.g. <plate>OB123</plate>

Questions:

• Does ISAPI support this kind of manual plate recognition trigger?
• If yes, what is the correct API endpoint and request format?
• Are there any limitations or additional steps needed to retrieve the plate data?

I have found partial documentation, but since Hikvision doesn't provide full API specs unless you're a partner, it's hard to verify how this works in real-world scenarios.

Any insights would be greatly appreciated!

Thanks!

Hikivision camera supports the manual recognition through ISAPI integration, you can do it with the request below:

[GET]
{cameraIp:port}/ISAPI/Traffic/MNPR/channels/1?laneNo=1&OSD=1

And you'll get a response similar to this

-----------------------------7daf10c20d06
Content-Disposition: form-data; name="mnpr.xml"; filename="mnpr.xml"
Content-Type: text/xml
Content-Length: 2176



<?xml version="1.0" encoding="utf-8"?>
<EventNotificationAlert version="2.0" xmlns="http://www.isapi.org/ver20/XMLSchema">
    <ipAddress>192.168.1.221</ipAddress>
    <ipv6Address>::</ipv6Address>
    <portNo>20480</portNo>
    <protocol>HTTP</protocol>
    <macAddress>bc:5e:33:47:dd:ec</macAddress>
    <channelID>1</channelID>
    <dateTime>2025-06-02T10:50:28.169-05:00</dateTime>
    <activePostCount>2</activePostCount>
    <eventType>ANPR</eventType>
    <eventState>active</eventState>
    <eventDescription>ANPR</eventDescription>
    <channelName>ENTRADA_01</channelName>
    <ANPR>
        <licensePlate>unknown</licensePlate>
        <line>1</line>
        <confidenceLevel>0</confidenceLevel>
        <plateType>unknown</plateType>
        <plateColor>unknown</plateColor>