The ethernet to serial converter supports 4 TCP or UDP Sessions, and also supports a TCP Server, TCP Client, TCP Auto, UDP Advanced TCP Server, Advanced UDP Operating modes and AT, Web access modes.

So here is a simplified version of the serial connection pinout used on personal computers: the RS-232 9 pin pinout. The Case Communications 3611 Serial to Ethernet Converters is an RS232 to ethernet converter allowing a serial device to operate over an Ethernet Network and manage serial devices and hosts in remote locations via the network. The 3611 supports 1 x RS232 / RS-485 / RS-422 serial interface and 1 x 10Mbps / 100Mbps Ethernet interface. Wiring: RS232 cables can be wired in a few different ways, including straight-through and null-modem wiring. Make sure to choose the right wiring configuration for your specific needs. my actual setup consists of a PV power plant using a Studer Xtender XTM 4000-48 battery inverter and the corresponding RS-232 interface (Xcom-232i) to control the device. I would like to use the MOXA NPort Ethernet bridge instead of plain RS-232 communication due to the rather large distance (> 20m) between the inverter and the Raspberry Pi running Node-RED v3.0.2. A secondary data channel, identical in capability to the primary channel, can optionally be implemented by the DTE and DCE devices. Pin assignments are as follows:The large voltage swings and requirement for positive and negative supplies increases power consumption of the interface and complicates power supply design. The voltage swing requirement also limits the upper speed of a compatible interface. RS232C Standard". Knowledgebase. National Instruments. Archived from the original on 2017-03-05 . Retrieved 2017-03-05. An rs232 to ethernet converter allows legacy devices running serial ports to operate over an IP Network. The ethernet serial port adapter either transports the RS232 data from one point in the network to another point or provides the function of an ethernet to serial converter allowing a PC to run a protocol such as Telnet to connect to a Serial device. Supports TCP server, TCP client, UDP mode, and UDP multicast. As a TCP client, it also supports TCP server-side functions. Supports 30 TCP connections as a TCP server and 7 destination IPs as a TCP client. EIA RS-232-C (August 1969) "Interface Between Data Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange" [2]

Open SSCOM to simulate the user's serial port program, open COM2 (the virtual serial port above), open another SSCOM to simulate a serial port device, and open COM3 (hardware serial port). At this time, the data link sent by COM2 is as follows: COM2 —> Vircom —> the network port of the serial server —>the serial port of the serial server —> COM3.RS-232 was first introduced in 1960 [2] by the Electronic Industries Association (EIA) as a Recommended Standard. [5] [1] The original DTEs were electromechanical teletypewriters, and the original DCEs were (usually) modems. When electronic terminals (smart and dumb) began to be used, they were often designed to be interchangeable with teletypewriters, and so supported RS-232. Point-of-Sale (POS) Systems: RS232 is utilized in POS systems for connecting devices such as barcode scanners, cash registers, and receipt printers, ensuring seamless data transfer. If the user's Modbus TCP software is used as a slave station (Slave), it is necessary to select the conversion protocol, then change the working mode to the client, the destination IP to the IP of the computer where the Modbus TCP software is located, and the destination port to 502, as shown in the figure below shows. Because both ends of the RS-232 circuit depend on the ground pin being zero volts, problems will occur when connecting machinery and computers where the voltage between the ground pin on one end, and the ground pin on the other is not zero. This may also cause a hazardous ground loop. Use of a common ground limits RS-232 to applications with relatively short cables. If the two devices are far enough apart or on separate power systems, the local ground connections at either end of the cable will have differing voltages; this difference will reduce the noise margin of the signals. Balanced, differential serial connections such as RS-422 or RS-485 can tolerate larger ground voltage differences because of the differential signaling. [12] The number of converted devices is strictly limited by the converter’s specification. Manufacturers typically make converters with 1, 2, 4, 8, 16, or 32 ports.

To transmit data effectively, RS232 utilizes a method called data encoding. It converts the binary data into a format suitable for transmission over the serial connection. Commonly used encoding schemes include ASCII (American Standard Code for Information Interchange) and Unicode. Start and Stop Bits During asynchronous communication, both RTS and CTS are on all the way through the session. Yet, if DTE is connected to a multipoint line, data is transmitted by one station at a time (due to the return phone pair sharing), so the only use for RTS is to turn the modem’s carrier on and off. A station raises RTS when it’s ready to transmit. The modem turns on its carrier, waits until it’s stabilized (normally it takes a couple of milliseconds), and raises CTS. While CTS is up, DTE transmits. Once the transmission is finished, the station drops RTS and then the modem drops both CTS and carrier. Device networking is what powers M2M (machine to machine) communication. The UDS family of external device servers enables users to connect, manage and control just about any piece of equipment with a serial port from virtually anywhere over Ethernet or the Internet. In fields such as laboratory automation or surveying, RS-232 devices continue to be used. Some types of programmable logic controllers, variable-frequency drives, servo drives, and computerized numerical control equipment are programmable via RS-232. Computer manufacturers have responded to this demand by re-introducing the DE-9M connector on their computers or by making adapters available. A Serial to Ethernet converter is usually used to enable a device with a serial interface to connect to a remote computer over a network. Many industrial and consumer devices are equipped with RS232/RS422/RS485 ports. By using an RS232 to Ethernet adapter you can access and control remote printers, barcode scanners, industrial monitoring sensors, and any other network-attached serial device from one central location. This saves time and increases your efficiency.

Details

According to the RS-232 standard, all data is bi-polar. For most equipment, an ON or 0-state (SPACE) condition is indicated by voltage from +3 V to +12 V and an OFF or 1-state (MARK) condition is indicated by voltage from -3 V to -12 V. However, some devices don’t recognize any negative levels and 0 V is enough for the OFF state. And sometimes smaller voltages can be enough to achieve the ON state. Thereby it’s possible to significantly reduce the overall range for RS-232 transmission/receiving. Engineers and Project Managers that require a cost effective 4 or 8 port serial RS232-to-Ethernet solution that maintains serial device protocol integrity across Ethernet must consider the IOLAN STG. Having the highest performance processor available along with the Perle’s unique TrueSerialTM technology, the IOLAN STG will provide the most authentic serial connections across Ethernet. IOLAN STG4-P Serial Terminal Servers are also available with support for Power over Ethernet (PoE). IOLAN STG Secure Serial Terminal Servers are ideal for:

The CTS (Clear to Send) signal is used by the DCE device to indicate that it is ready to receive data from the DTE device. When the DCE is prepared to receive data, it sets the CTS line to a logic high (1) level. The DTE receives this signal and can proceed with transmitting data. There are no cable length limits defined directly by the RS-232 standard, so the main determining factor is the maximum capacitance tolerated by a compliant drive circuit. As a general rule, the critical length will be 15 m (or about 300 m provided that only low-capacitance cables were used). Frankly speaking, For longer distances, the RS-232 standard isn’t the best option for high-speed long-distance data transfer.

Electrical signal characteristics such as logic levels, baud rate, timing, and slew rate of signals, voltage withstand level, short-circuit behavior, and maximum load capacitance. There are two versions of this product, they are the same in terms of the software, and the differences in hardware functions are as follows: Compared with later interfaces such as RS-422, RS-485 and Ethernet, RS-232 has lower transmission speed, shorter maximum cable length, larger voltage swing, larger standard connectors, no multipoint capability and limited multidrop capability. In modern personal computers, USB has displaced RS-232 from most of its peripheral interface roles. Thanks to their simplicity and past ubiquity, however, RS-232 interfaces are still used—particularly in industrial CNC machines, networking equipment and scientific instruments where a short-range, point-to-point, low-speed wired data connection is fully adequate. [3] Scope of the standard [ edit ]