The ETH232WG standard MODBUS gateway - between RTU / ASCII conversion Boshi ETH232WG standard MODBUS gateway MODBUS TCP Ethernet MODBUS TCP protocol and serial MODBUS RTU protocol, Ethernet MODBUS TCP protocol and serial MODBUS ASCII protocol conversion. ETH232WG an Ethernet / serial converter. It has a small form factor (80 * 25 * 55mm), RS-232, RS-485, RS-422 universal, virtual local COM serial port via Ethernet - Serial Port Mapper. ETH232WG is the world's smallest, easiest MODBUS gateway. ETH232WG inside with high-speed optical isolation, Ethernet, power, serial tripartite isolation. Patented product, beware of counterfeit! Patent No.: 200630307752,200730098650 ETH232WG standard MODBUS gateway 5V power supply (5-24V) 0-115.2Kbps MODBUS TCP RTU / ASCII Profile standard MODBUS gateway with ordinary Ethernet serial converter The fundamental difference is that the the standard MODBUS gateway Ethernet port can be connected to an Ethernet device, as long as the device's Ethernet port compliant MODBUS protocol, both as host (Master) or from the machine (Slave). The Modbus Protocol fact ASCII, RTU, TCP. Standard Modicon controllers use RS232, RS-485 or RS-422 serial Modbus. Serial Modbus ASCII, RTU protocol provides news, data structure, command and on the way A data communication Maser / Slave. Modbus protocol requires data to verify the serial protocol used parity ASCII mode with LRC checksum the RTU mode using 16-bit CRC checksum. No additional requirements parity Modbus TCP mode, because TCP is a reliable connection-oriented protocol. Ethernet MODBUS TCP protocol is MODBUS RTU / ASCII protocol encapsulated into TCP packets is not much difference in essence, run in RTU / ASCII RS-232 or RS-485 serial communications platforms, TCP is running on Ethernet platform. Serial RTU transmission hexadecimal numbers, serial ASCII transfer ASCII characters. MODBUS TCP and MODBUS RTU protocol is very similar. MODBUS TCP essentially remove the RTU serial communications protocol CRC checksum pure data, then start in a purely data plus 5 0 and 6 via TCP / IP network protocol sent to. MODBUS TCP service port 502 by default. The MODBUS RTU essentially remove MODBUS TCP header pure data, and then followed by the CRC check and sent through the serial communication protocol can Examples of protocol conversion format: MODBUS TCP packet: 00 00 00 00 0,006,030,300,000,005 convert the RTU format after data: 03 03 00 00 00 05 84 2B (84 2B CRC16). Similarly RTU packet back to the server also RTU to TCP format conversion. The 2, ETH232WG standard MODBUS gateway features: * The use of industrial-grade 32-bit ARM processor, high reliability and low power consumption. * 100/10M adaptive Ethernet interface, automatic support cross line / direct connection. * RS-232/485/422 triple serial port baud rate from 300bps to 115200bps with terminal board. * Built-in network 1000V electromagnetic isolation and serial port 2500V optical isolation with power isolation. * Support Universal Socket operation modes, including TCP Server / Client and UDP. * Supports power down or off the network automatically recover, eliminating the need for a lot of maintenance costs. * Support for status monitoring. Connection indicator to analyze the work of the state of the server. * Platform software automatically searches for the server. * Support for 5 to 24V DC wide voltage input. * The gratuitous software support protocols: ARP, IP, ICMP, TCP, UDP, DHCP, DNS, etc. standard TCP / IP protocol and Modbus TCP, Modbus RTU, Modbus ASCII. * Operating Temperature: -10 ~ 70 ? C Storage temperature: -40 to 85 ? C * operating system requirements: Windows2000/XP/7. Hardware installation the ETH232WG connected to the power supply (DC 5-24V, 5V power supply matching with the product). RJ-45 jack on one small LED lights, LED stays on when the product is energized. Another LED lights on the RJ-45 jack the LINK connection indicator. The RJ-45 plug can be inserted into the Ethernet RJ-45 seat. Automatically correct for crossover and straight connection LINK lights. Boshi the RS-232/485/422 serial ETH232WG the end is a DB-9-pin Block, RS-232, RS-485, RS-422 pin. Exactly the same as the RS-232 port with DB-9-pin RS-232 port of the PC, 2,3,5 foot allocation. As RS-422, T +, T-refers transmitted from ETH232WG outwardly. Note proposed to the grounding line (5 feet), RS-485 and RS-422 communication. Jumper selectable RS-485/422 without. The RS-485/422 signal reference ground GND RS-232 is the same. DB-9-pin end of the pin allocation is as follows (with terminal block): 1 2 3 4 5 6 7 8 9 RS-232 RXD TXD GND RS-485 A GND B RS-422 T + GND R + of R-T-ETH232WG not only Ethernet transformer isolation (1000V), but also increase one pair of serial 2500V photoelectric isolation, Ethernet (RJ-45), an external power supply, serial (RS-232/485 network (RJ-45) and serial / 422) tripartite isolation. ETH232WG serial highest communication rate 115.2Kbps. RS-485 port built-in 600W anti-lightning surge protector. 4, software to set the IP address of the computer network port 3 set to 192.168.0 the Modbus gateway using the transparent transmission of data, that is, any data received by the serial port are forwarded to the network, the user can use any communication protocol network communication can be achieved without changing the original program. The Modbus gateway uses ETH232WG setup by network configuration parameters, the initial interface as shown below: each button functions are described as follows: search equipment: Search Modbus gateway (on the same network segment Modbus gateway) connected to the network in results show MAC address list box. The status query: whether to establish a TCP / IP connection can query to the Modbus gateway equipment. Read / modify device parameters: read and set the Modbus gateway settings. Select a MAC address bar can be read or set the MAC address edit box corresponding to the parameters of the Modbus gateway. When the physical address list box Modbus gateway, it becomes effective. Users in the appropriate box, enter the parameters you want to configure, press this button will be written to the Modbus gateway. Serial 1 parameter settings mode up to eight kinds of work: 1: TCP Client 2: TCP server: UDP client: UDP server 5: RTU_Master - TCP_Slaver 6: TCP_Master - RTU_Slaver 7: ASCII_Master- -TCP_Slaver 8: TCP_Master - ASCII_Slaver which mode 1 to 4 Ethernet / serial converter. Active working model to explain the power-TCP client TCP server listens on TCP port specified UDP port TCP connection requests when the serial data received UDP server to send data to the specified UDP server in the specified UDP client requests a connection to the TCP server received on UDP data mode 5 to 8 MODBUS TCP RTU / ASCII conversion. Operating modes explained RTU_Master the - TCP_Slaver TCP_Master the - RTU_Slaver ASCII_Master - TCP_Slaver TCP_Master - ASCII_Slaver port: communication with other network equipment, the Modbus gateway using port number. Domain name: default do not use. Server IP: Modbus gateway settings for TCP Client to communicate with Modbus gateway computer's IP address. Server port: Modbus gateway settings for TCP Client's computer to communicate with Modbus gateway port. Flow control: the parameters of the device connected to the serial port with Modbus gateway. With or without flow control, hardware flow control (RTS / CTS), software flow control (XON / XOFF) three ways available settings. The serial interval timeout: serial port to send packets to the network, the maximum time interval between the last byte and the next byte, Modbus gateway that during that time period did not receive the next byte, put the packet forwarded to the network. proposed to be set to "10" "20" "30" serial work: RS-232, RS-485, RS-422, in fact, this option has no effect. , Virtual serial software practical guidance Note: TCP communication principle must be one of the TCP client, the other the TCP server computer's IP when the work for ETH232WG TCP Client: For example: modify parameters and serial devices . Virtual serial port management program should be configured as follows: When the status is Connected to prove that is already connected to the success of the computer's IP Note: TCP communication principle must be one of the TCP server, the other is a TCP client work when ETG232WG TCP Server: For example: modify parameters for serial devices. The virtual serial management program should be configured: a ETH232WG the IP needs to point I / O Options ... untick directly connected.