If SmartLogger1000 & 2000 needs to connect to an outdoor device over a COM port, you are advised to connect an RS485 signal SPD between the SmartLogger1000 & 2000. The device will thus strengthen the surge protection capability.
When determining the installation position, verify that the linear distance between the RS485 signal SPD and the SmartLogger is not greater than 500 mm.
Prepare an RS485 signal SPD. The recommended model is PowerSA-5KA-15V and can be purchased from Huawei.
Each RS485 signal SPD can connect to two COM ports. Each SmartLogger2000 can be configured with a maximum of 3 RS485 signal SPDs and a Smartlogger1000 with a maximum of twu RS485 signal SPDs.
When connecting the RS485 signal SPD, you need to connect its PE cable and communications cable:
1. Prepare a ground cable. Recommended: outdoor copper-core cable with a cross-sectional area of 4 mm2 or 12 AWG;
2. Prepare a communications cable; for example, a two-core or multi-core cable with a cross-sectional area of 0.5–2.5 mm2.
One RS485 signal SPD provides two RS485 surge protection ports:
Port description:
Note:
● Protection ports connect to the COM ports on the SmartLogger. Port 4 is not connected.
● Surge ports connect to the RS485 ports on other devices. Port 3 is the ground port.
● Protection ports and surge ports must not be confused.
● One RS485 signal SPD can protect two COM ports.
● Protection ports 2 and 6 and surge ports 1 and 5 form an RS485 surge protection port for protecting one COM port. Protection ports 8 and 12 and surge ports 7 and 11 form another RS485
surge protection port for protecting another COM port.
● An RS485 signal SPD port supports cables with a maximum cross-sectional area of 2.5 mm2. If devices need to be connected to this port in parallel, use cables with a cross-sectional area of 1
mm2, and connect not more than two cables to the same port.
Procedure:
Connect the PE cable:
1. Remove 8 mm of the insulation layer from the PE cable using a wire stripper.
2. Insert the bare core wire into port 3 on the RS485 signal SPD, and secure the cable.
Connect the communication cable:
1. Connect one end of the cable to the COM port on the SmartLogger.
2. Insert the bare core wire at the other end into a protection port on the RS485 signal SPD,
and secure the cable.
Verify that the COM+ (RS485A) port on the SmartLogger connects to protection port 2 or 8
on the RS485 signal SPD and that the COM– (RS485B) port on the SmartLogger connects to
protection port 6 or 12 on the RS485 signal SPD.
3. Strip cables.
4. Insert the bare core wire into the surge port on the RS485 signal SPD, and secure the
cable.
5. Connect the other end of the cable to the communications port on the connected device.
Verify that the RS485A port on the device connects to surge port 1 or 7 on the RS485 signal SPD and that the RS485B port on the device connects to surge port 5 or 11 on the RS485 signal SPD. For details about cable connections, see the description about the connected
device.
