[Acquisition type]：analog
[Interface type]：RS485/Ethernet
[Number of acquisition channels]：4
[Network type]：Ethernet
[Product weight]：230.8±5g
[Introduction]：E821-RTU(0400-ETH) is a network data acquisition product that supports 4 analog (current) inputs. It supports Modbus TCP/RTU protocol. The product is highly user-friendly and can be easily and quickly integrated into your own system to realize network-based remote data acquisition. The product is sprayed with three-proof paint and has the functions of “anti-mold”, “anti-moisture” and “anti-salt spray”.
| Foot number | Port and other definitions | Function | illustrate |
1 | RJ45 port | Ethernet interface | Standard RJ45 interface, connected to device or PC |
2 | DC-IN socket | DC socket 5.5*2.1mm | Power input terminal, DC 8V~28V, 12V/24V recommended |
3 | DC-IN + | Press-wire power input positive terminal | Power input, DC 8V~28V, 12V/24V recommended |
4 | DC-IN - | Press-wire power input negative pole | Power reference ground |
5 | RS485G | RS485 reference ground | Signal reference ground, not connected |
6 | RS485 A | RS485 port A | RS485 port A is connected to device A port |
7 | RS485 B | RS485 port B | RS485 port B is connected to device B port |
8 | Ground screw | Connecting with the Earth | Connecting with the Earth |
9 | Reset | Reset button | Long press 5S to work |
10 | AI1+ | Analog signal input channel 1 positive | Analog signal input channel, used in combination with the negative pole to collect analog quantity |
11 | AI1- | Analog signal input channel 1 negative | Analog signal input channel, used in combination with the positive electrode to collect analog quantity |
12 | AI2+ | Analog signal input channel 2 positive | Analog signal input channel, used in combination with the negative pole to collect analog quantity |
13 | AI2- | Analog signal input channel 2 negative | Analog signal input channel, used in combination with the positive electrode to collect analog quantity |
14 | AI3+ | Analog signal input channel 3 positive | Analog signal input channel, used in combination with the negative pole to collect analog quantity |
15 | AI3- | Analog signal input channel 3 negative | Analog signal input channel, used in combination with the positive electrode to collect analog quantity |
16 | AI4+ | Analog signal input channel 4 positive | Analog signal input channel, used in combination with the negative pole to collect analog quantity |
17 | AI4- | Analog signal input channel 4 negative | Analog signal input channel, used in combination with the positive electrode to collect analog quantity |
18 | PWR | Power indicator | Red on power on, long on |
19 | NET | Ethernet connection instructions | Blue-green dual-color LED, Ethernet port connected to TCP/UDP. After successful connection, the blue LED is on, and the green LED is on after power-on. It indicates that it is initializing. |
20 | DATA/RST | Data sending and receiving indication/reset indication | Blue-green dual-color LED, blue LED flashes when data is sent or received, green LED flashes 3 times when key reset is successful |