ESP-4104 is a WIFI serial device server launched by Zhejiang Eastron. It is a high-performance wifi serial device server. Ethernet and WIFI can be used meanwhile, and the configuration is more convenient. The ESP-4104 is positioned on high stability, rich function, suitable for the high real-time and stability industrial applications, particularly for wireless remote monitoring such as PLC and so on.

The high quality power supply design in 9~48V wide voltage provides better industrial environment adaptability; Can be equipped with installation guide accessories.

The ESP-4104 not only have the function of RS232/RS485/RS422 to WIFI TCP/IP, and integrated the function of Modbus TCP gateway, can easily achieve the Modbus RTU protocol converting to Modbus TCP WIFI protocol.

ESP-4104 can be applied to:

? PLC Remote Wireless Monitoring

? Power /Electronic /Intelligent Instrument

? Bank /Medical Automation System

? Industrial Automation System

? Information Household Appliances

4. Hardware Instruction

The front view of ESP-4 WIFI serial server is shown in Figure1. ESP-4 uses black anti-radiation SECC board. Left and right are with two "ears" to facilitate the installation.

Size:

L × W × H = 9.4cm × 6.5cm × 2.5cm

Panel Light:

1) ACT: ACT lights up when green indicates that data is normally transferred between WIFI/Ethernet and RS232/485/422. When the ACT light blinks blue, it indicates that data has been returned from RS232/485/422 to WIFI/Ethernet. If the data is short then blue flashing time is relatively short, need to pay attention to view.

2) LINK: LINK lights are green when the RJ45 cable is connected. When the LINK light is blue, it indicates that the TCP connection is established or is in UDP mode.

3) POWER: Indicates that the serial server is powered on.

4) WIFI: WIFI is blue when it indicates that WIFI has established a wifi connection with router as an STA or as an AP there has wifi establishing a connection with it. When the WIFI light is green: 2 seconds flashes, it indicates that it is in AP mode and no wifi connection is established; It flashes every 5 seconds, indicating that the device is in STA mode and is connecting with the router.

The serial interfaces in front of the server area shown in Figure 4, from left there have:

1) Ethernet port: standard RJ45 interface

2) R-, R+, T+, T-: where T+ is RS485A, T- is RS485B; if you need RS422, you can connect these four lines.

3) Terminal power supply +, -: voltage is 9~48VDC.

4) Power outlet: you can use the standard 5.5mm plug (core for the positive), the voltage 9~48VDC.

The back panel of serial server is as shown in Figure 5, from left there have:

1) WIFI antenna. You can choose to the extending line antenna, easy to install to the outside of the metal cabinet.

2) Reset switch: putting on the reset mode, will reset wifi work mode to the AP mode, SSID, password is empty, IP into 192.168.1.254.

3) Serial port using standard DB9 male: line sequence as shown in Table 1: