To switch the decoder into Test Mode, the host sends
STOPOPERATION<CrLf>
The decoder responds with:
If the operation mode was stopped:
STOPOPERATION;OK<CrLf>
If the decoder already was in Test Mode:
STOPOPERATION;TESTMODE<CrLf>
Example
← STOPOPERATION<CrLf>
→ STOPOPERATION;OK<CrLf>