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Connecting the RS485 Signal SPD
Prerequisites
The communications cable is prepared. The DJYP2VP2-22 2x2x1 network cable or a communications cable with a cross sectional area of 1 mm2 and outer diameter of 14–18 mm is recommended.
Context
The way of connecting two RS485 signal
SPDs is the same as the way of connecting one RS485 signal SPD.
One RS485 signal SPD provides two RS485 surge protection ports,
as shown in Figure 4-3.
Table 4-1 describes the surge protection
ports.
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Table 4-1 Port description
RS485 Surge Protection Port |
Protection Port |
Function |
Surge Port |
Function |
|---|---|---|---|---|
| RS485 surge protection port 1 | 2 | RS485A, for RS485 positive differential signaling | 1 | RS485A, for RS485 positive differential signaling |
| 6 | RS485B, for RS485 negative differential signaling | 5 | RS485B, for RS485 negative differential signaling | |
| RS485 surge protection port 2 | 8 | RS485A, for RS485 positive differential signaling | 7 | RS485A, for RS485 positive differential signaling |
| 12 | RS485B, for RS485 negative differential signaling | 11 | RS485B, for RS485 negative differential signaling |
- Protection ports are connected to COM ports on the SmartLogger. Port 4 is not connected.
- Surge ports are connected to RS485 ports of other devices. Port 3 is the ground port.
- Protection ports and surge ports must not be reversely connected.
- One RS485 signal SPD can protect two COM ports.
- Protection ports 2 and 6 and surge ports 1 and 5 form an RS485 signal SPD port for protecting one COM port. Protection ports 8 and 12 and surge ports 7 and 11 form another RS485 signal SPD port for protecting one more COM port.
Procedure
- Remove an appropriate length of steel armor and insulation layer from the cable using a wire stripper, as shown in Figure 4-4.
- Remove the terminal block from the SmartLogger COM port, as shown in Figure 4-5.
- Connect the cable to the SmartLogger terminal
block, as shown in Figure 4-6.
- Press the white contact plate of the corresponding wiring terminal to flip the metal spring inside the wiring terminal.
- Insert the uninsulated part of the core wire into the wiring terminal.
- Release the white contact plate to fasten the core wire.
- Insert the terminal block into the SmartLogger COM port.
- Insert the bare cable cores at the other end of the cable into a protection port of the RS485 signal SPD, as shown by (1) in Figure 4-7.
- Use a flat-head screwdriver to tighten the screws on the protection ports, as shown by (2) in Figure 4-7.
