Serial Port Communication Service 3
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How Do I Connect “3-Wire” RS-232 Using FOSTC Fiber Converters?
PAGE 1 OF 4 RS-232 Connections Q: How do I connect “3-Wire” RS-232 using FOSTC Fiber Converters? A: A “3-Wire” RS-232 supports TD, RD and GND coonections. The RS-232 connection on the FOSTC is wired DCE like a modem. From a computer DB25M (male) RS-232 port, the cable is straight pin to pin. The DB9M (male) connector used on the orignal PC/AT changed pin numbers, but TD still connects to TD, RD to RD and GND to GND (see left side of the figure below). If the serial port on the RS-232 device is wired DCE like a modem, then a crossover of TD & RD between the device and the FOSTC is needed (see fthe right side of the figure below) Some RS-232 devices require hardware handshaking, but the the FOSTC and FOSTCDR don’t support those signals, the connections are looped back. If needed, use models 232FLST or 9PFLST which support RTS/CTS connections. Check FAQ for those models. Connection figure below: Set switch Sw 1:6 to OFF. Other switches have no effect on RS- 232 operation. If using one end as RS-232, the other end as RS-422 or RS-485, the RS-232 side will match either the left or right side connections in Figure 1. Figure 1: RS-232 Connections 1. The RS-232 device on the left side has DTE pinouts which match a computer with DB9M connector. Pin #3 is output (Tx), pin #2 is input (Rx), pin #5 is ground. See DTE figure for DB-25 pinouts. -
D: Serial Driver
CHAPTER 7 Serial Driver 7 This chapter describes how you can use the Serial Driver to transfer data to a device connected to a Macintosh modem or printer port. The Serial Driver supports 7 asynchronous serial data communication between applications and serial devices Serial Driver through these ports. The Serial Driver provides low-level support for communicating with serial devices that cannot be accessed through the Communications Toolbox or Printing Manager. For example, a scientific instrument or a printer that does not support QuickDraw. Before you decide to use the Serial Driver, you should determine whether it is the appropriate solution for your communication needs. The Communications Toolbox is the recommended method for integrating modems and other telecommunications devices into the Macintosh environment. The Communications Toolbox provides hardware-independent services and a standard interface that offers compatibility with all Macintosh models. To find out more about the Communications Toolbox, see Inside the Macintosh Communications Toolbox. Likewise, the Printing Manager is the recommended interface for printers and similar output devices. Using the Printing Manager makes your hardware or software product compatible with every other device or application that supports this standard interface. Refer to Inside Macintosh: Imaging With QuickDraw for more information. To use the Serial Driver, you should understand how to open, close, and communicate with device drivers using the Device Manager. You can find this information in -
User Manual RST425 Iridium SBD Modem
RST425 Short Burst Data Modem Installation & User Manual Beam Communications Pty Ltd RST425 INSTALLATION & USER MANUAL RST425 Installation and User Manual Beam Communications Pty Ltd 8 Anzed Court, Mulgrave, Victoria, 3170, AUSTRALIA Information furnished by Beam Communications Pty Ltd (Beam) is believed to be accurate and reliable. However, no responsibility is assumed by Beam for its use, or for any infringement of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Beam. Beam reserves the right to change specifications at any time without notice. Copyright © 2008 Beam Communications Pty Ltd. All rights reserved Product name: RST425 Installation & User Manual Manual revision: 02 Part Number USRMAN003702 Issue Date: July 2008 2 RST425 INSTALLATION & USER MANUAL Content SAFETY INFORMATION................................... 4 RS232 PORT ELECTRICAL PARAMETERS....... 12 DATA CONNECTIVITY ....................................... 13 ABOUT BEAM COMMUNICATIONS .............. 5 CONFIGURATION SETTINGS .............................. 13 WHAT IS THE RST425? ................................... 6 Modes of Operation ..................................... 13 SERIAL PORT SIGNAL LEVELS............................ 14 PACKAGE CONTENTS......................................... 6 Data Port Inputs .......................................... 14 OPTIONAL BEAM ACCESSORIES ........................ 6 Data Port Outputs........................................ 14 -
Rs-232 Training
January 28, 2002 MAN214 Rev 1.1 RS-232 TRAINING HISTORY RS-232 was originally adopted in 1960 by the Electronic Industries Association (EIA). Over the 40+ years since this standard was developed, the Electronic Industries Association published three modifications, the most recent being the EIA232E standard introduced in 1991. In this document we will see several parts of the original RS-232C standard and mostly the ones used in the PC world. This document will describe the use and configuration of serial ports using RS-232. EQUIPMENT DEVICE TYPE RS-232 was created for one purpose, to interface between Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) employing serial binary data interchange. A PC is a DTE device, while most other devices that connect to PC serial ports are usually DCE devices. Since most DCE devices are meant to be connected to a PC, they will have a DB-9 pin female connector. All PC’s have a DB-9 or DB-25 male connector for the serial port. This means that a standard cable would be female to male for either DB-9 or DB-25 pin ports. DTE devices supply the brains for the operation – a PC requests data via bi-directional ASCII communications from a 7000XL (or any Doran indicator) – making the 7000XL a DCE device. It is also common to have a 7000XL print directly to a dumb printer or a label printer. In both of these cases, the 7000XL is the brains of the operation (DTE) as it directs the printer (DCE) what to print and when. -
Serial Communications RS232, RS485, RS422
Technical Brief AN236 Raveon Technologies Corp Technical Brief AN236 Rev D Serial Communications RS232, RS485, RS422 By John Sonnenberg Raveon Technologies Corp S u m m a r y Electronic communications is all about interlinking circuits (processors or other integrated circuits) to create a symbiotic system. For those individual circuits to swap information, they must share a common standard communication protocol. Many communication protocols have been designed to achieve data exchange. The most common serial communication protocols are RS232, RS485, RS422, USB, and Ethernet. But because USB and Ethernet require powerful interfaces with complex protocols, many efficient devices utilized RS232, RS485, and RS422 which is what this note is all about. Protocol Comparison Chart RS-232 RS-422 RS-485 Single ended multi- Single ended Multi-drop Cable drop 1 transmitter 1 transmitter 32 transmitters Number of Devices 1 receiver 10 receivers 32 receivers Communication Full duplex, Full duplex, Full duplex Mode Half duplex Half duplex 4000 feet at 100 4000 feet at 100 Maximum Distance 50 feet at 19.2 kbps kbps kbps Max Data Rate (50 1 mbps 10 mbps 10 mbps feet) Digital 1 / Digital 0 -V / +V +V / -V +V / -V Serial Protocols The RS232, RS485, RS422 serial protocols only relate to the hardware interface, not the software protocols used to make the devices communicate. There are many protocols that Copyright 2018 1 Raveon Technologies Corp. exist in the market place so one cannot assume interoperability between different manufacturers of "RS232" ports. To define Instruments that supports a mixture of industry standard and proprietary serial protocols: M o d b u s R T U This protocol is used in industrial applications and most SCADA PLC’s have drivers for Modbus RTU. -
Understanding Power Requirements in RS-232 Applications (Rev. B)
Application Report SNLA037B–October 1993–Revised April 2013 AN-914 Understanding Power Requirements in RS-232 Applications ..................................................................................................................................................... ABSTRACT This application note covers the RS-232 circuit functions, an explanation of hardware handshaking, a step by step analysis of the hardware handshaking between a local and remote terminal, and power requirements/dissipation of the DS14C335. Contents 1 Introduction .................................................................................................................. 2 2 RS-232 Handshaking Circuits ............................................................................................. 2 3 Hardware Handshake Flow ................................................................................................ 3 4 Power Consumption ........................................................................................................ 4 5 DS14C335 and Power Consumption ..................................................................................... 5 6 Other Industry Standards (RS-232) ...................................................................................... 7 7 Conclusion ................................................................................................................... 8 8 References ................................................................................................................... 8 List of Figures -
Serial Communications Thomas C
Serial Communications Thomas C. Wilson, Jr. ● [email protected] Instrument Laboratory ● School of Marine and Atmospheric Sciences Stony Brook University UNOLS RVTEC 2015 Miami FL – v2.9 1 Standard Disclaimers Unless otherwise noted: • Mention of a company in this presentation does not constitute an official endorsement by the State of New York, the State University of New York, or the School of Marine and Atmospheric Sciences. • The presenter has no ownership interest in any commercial entity mentioned. Special RVTEC “No Chop-Busting” Disclaimers • The presenter has never dated anyone connected to any mentioned company, nor is this ever likely. Neither have those folks plied him with baubles, nor trinkets, nor fancy food and drink. Anyone who implies otherwise is asking for trouble. TODAY - ASYNCHRONOUS SERIAL Serial communication Transmission of digital data one bit at a time, in sequence. Asynchronous communication Transmission of data without the use of a separate clock or trigger signal. Any timing required to recover data is encoded within the transmission. 4:00 BITS, BYTES, AND FRAMES Technically a “frame” but usually referred to as a “character”. Mark level is idle, logic 1s, and stop bit(s). Space level is start bit and logical 0s. In the example above Mark is high level and Space is low level, but this is not the case for all protocols BITS, BYTES, AND FRAMES Start bit signals beginning of frame/character. Data bits: commonly 8, sometimes 7, almost never others. • The least significant bit is sent first. • Character represented above is 11001011 = ASCII 203 BITS, BYTES, AND FRAMES Parity bit can be none=nonexistent (most common), mark, space; or even/odd to detect transmission errors. -
Dial-Up System Example Typical Dial-Up System
Dial-Up System Example Typical Dial-Up System SHARED DIAL-UP TELEPHONE LINE LINE SHARING SWITCH PROGRAMMABLE PRIORITY DFR PUBLIC MODEM TELEPHONE DISTRICT MODEM SYSTEM DESKTOP- METER LAPTOP MODEM POLLING DIAL-UP CONTROLLER MODEM SER TELEPHONE LINE MODEM RELAY DIGITAL SIGNALS ANALOG SIGNALS A Modem Connects Your Computer To The Analog Phone System Modem History In the beginning… Computers brought about a need to interconnect Digital data exchange was expensive Computers transmit data using digital signaling Telephone circuits transmit analog signals Therefore, a device is needed to convert these signals Led to the creation of a modulator/demodulator Bell 202 modem ~ 300 baud Modem History Modem modulates an analog carrier signal to encode digital information Modem demodulates the carrier signal to decode transmitted data Modem History – Hayes Smartmodem Standard 300 bit/s modem Programmable by computer Could operate phone line using settings pick up hang up dial answer Modem History – Hayes Smartmodem Pre-Smartmodem Smartmodem To connect required 2 Computer dialed by step process: user sending command, manually dialed modem plugged number, then plugged directly into phone line handset into acoustic Modems operated in coupler either call or answer Modems were either mode – depending on call-only or answer- commands from only computer Modem History - Hayes Smartmodem Hayes Smartmodem features still in use today: 1. Command Mode and Data Mode 2. Command Syntax 3. Hayes Command Set 1. Command Mode & Data Mode Command Mode – modem is programmed Data Mode – data is sent to and from computers 2. Command Syntax AT begins each modem command Basic – character followed by a digit, ex. -
Waterlog RS-232 Communications
Technical Note D64 0815 RS-232 COMMUNICATIONS RS-232 is an Electronics Industries Association (EIA) standard designed to aid in connecting equipment together for serial communications. The standard specifies connector types, pin assignments, voltage levels, etc. Even though the specification exsists, it was not specific enough, and allowed manufactures options for its implementation. This means that if two devices are connected together, they still may not communicate. The main problem exists in the wiring of cable between the two devices, but in order to see what type of cable is needed, we need to first see what type of devices are being connected together, and what handshaking signals are needed for each device. DEVICE TYPES There are two types of RS-232 devices: Data Terminal Equipment (DTE), and Data Communication Equipment (DCE). One main difference between the two types of equipment is how the connectors are wired. Personal computers with a serial port are almost always configured as a DTE type of device. A modem is always configured as a DCE type of device. The H-350, the H-500, and the H-370-L are configured as DTE types of devices. Even though the H-350 and the H-500 are configured for DTE operation, they use a female connector. The connector for the DTE device has output pins that match up with input pins on the DCE device. This means that a straight through cable will normally work when connecting a DTE device to a DCE device. Notice in the two tables that follow, that the output pins of one type of device match the inputs of the other type of device.