1. Introduction
In this chapter we will cover:
- Requirements for the cables
- Requirements of the power supply
 | Never use the AC power! This will void the warranty and bring permanent damage to the electronics. The instrument might be damaged beyond repair. |  |
2. Overview M12 5-pin connector
Almost all connections are available via the M12 5-pin connector, located on the back of the Transmitter/display.
For use of Ethernet: use M12 4-pin connector, see chapter E4 Ethernet wiring.
The M12 5-pin connector:
| Pin | Signal | Wire color* |
| 1 | +12..24 VDC. | Brown |
| 2 | 0 Volt. | White |
| 3 | 4..20 mA. signal, active | Blue |
| 4 | RS485B | Black |
| 5 | RS485A | Grey |
* Wire colors apply to VPInstruments cables.
3. Cabling details
| For all connections! |
| Use: Shielded twisted pair cabling to avoid any interference from other outside electrical signals. |  |
| Always: Connect the shield to safety ground at one point. When in doubt, ask an expert to help with proper grounding and shielding of your installation. |  |
Thickness of wires depends on the cable length:
|
4. Power supply details
Input voltage: 12 to 24 VDC.
At the connector at least 12 Volt: be aware of the voltage drops over long cables!
The Transmitter/display will notify you when there is insufficient power:
5. Next step
Your communication protocol defines the type of wiring you will need.
| For RS485 communication go to ED2. RS485 Wiring |  |
| For analog output and communication go to E3. Analog output | |
| Ethernet communication go to E4. Ethernet wiring | |
| For only short-term measurement go to E5. Wiring for air audits | |