Set the start line tag to something like ticket start… set the same string on Sambapos printer template. Check with putty if your getting that data exactly. If with putty you see that string coming in… then your Dev should too.
With that knowledge try to troubleshoot it…
Step 1. Get any kind of data to come into putty.
Step2. Get start and end characters to show up in putty… step 3. Go to hikvision Dvr and try to play with the start end string and see if you can pull data.