Topsonic TM035 - Digital Multi-meter Usage

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3.7 Data Monitor
Once the PTZ device is connected, the Data Monitor is able to capture the
protocol from the controlling system and display command data. It is helpful
to debug and maintain RS485/RS232 communication.
3.8 Digital Multi-meter
3.8.1 SYMBOLS
U：DC Voltage Measuring U
~
：AC Voltage Measuring
A：DC Current Measuring A
~
：AC Current Measuring
Ω：Resistance Measuring ：Continuity Testing
：Diode Testing ：Capacitance Measuring