VSCOM SER-485 PRO User Manual

Serial to rs422/485 converter serial to rs422/485 converter serial to rs422/485 converter

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Serial to RS422/485 Converter

SER–485 PRO(–SI) User Manual

Tel: +49 40 528 401 0

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www.visionsystems.de

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service@visionsystems.de

Edition: April 2008

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Summary of Contents for VSCOM SER-485 PRO

Page 1 Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter Serial to RS422/485 Converter...
Page 2 Copyright c 2007 Vision Systems. All rights reserved. Reproduction without permission is pro- hibited. Trademarks VScom is a trademark of Vision Systems GmbH. All other trademarks and brands are property of their rightful owners. Disclaimer Vision Systems reserves the right to make changes and improvements to its product without pro- viding notice.
Page 3: Table Of Contents
Contents Contents 1 Overview 2 Introduction 3 Operation Modes 4 Technical Data 5 Conﬁguration of Hardware 5.1 Connectors ......... 5.2 Signal Assignments RS232 .
Page 4 List of Tables 8.3 ART 2 bit delay ........22 9 Firmware Update List of Figures Internal view of SER–485 PRO–SI...
Page 5: Overview
2 Introduction 1 Overview The SER–485 PRO converts signals between RS232 and RS422 or RS485. It is used to convert RS232 signals to RS422/485 networks based on diﬀerential balanced electrical signals to allow reliable and long distance (up to 1,3 km) connections . In RS485 halfduplex Mode the switching on and oﬀ...
Page 6: Operation Modes
3 Operation Modes multipoint protocol causes RS232 applications to fail when directly used for RS485 conﬁgurations. SER–485 PRO provides a unique bitrate speed adaptive ART feature, which take over multipoint protocol requirements for RS485. 3 Operation Modes The SER–485 PRO provides versatile operation modes. These are conﬁgured by software and DIP Switches.
Page 7: Technical Data
4 Technical Data a PC (Com1) a straight cable is required. In the OFF position the DTE conﬁguration is selected. When connecting to a PC (Com1) a null-modem cable is required. 4 Technical Data Operation 16 diﬀerent conversion modes RS232 signals TxD/RxD, RTS/CTS, DTR, GND (DB9 female conﬁgured as DCE or DTE) RS422 signals...
Page 8: Configuration Of Hardware
5 Conﬁguration of Hardware 5 Conﬁguration of Hardware The operation modes of the SER–485 PRO are conﬁgured by DIP Switches and software. There is no need to open the case and change jumper positions. Functions of Termination and Polarization (BIAS) are implemented by relays and special circuits. 5.1 Connectors Figure 1: Internal view of SER–485 PRO–SI CN1 is a DB9 female connector to attach the SER–485 PRO to an RS232 serial port.
Page 9: Signal Assignments Rs232
5 Conﬁguration of Hardware 5.2 Signal Assignments RS232 The signals of RS232 are connected to CN1, the exact conﬁguration is deﬁned by DIP3. DCE signal DTE signal Opt. VCC in Opt. VCC in Table 2: RS232 DB9 female The signals RxD, DSR and CTS are output, and have to be connected to the input signals of Com1, named the same.
Page 10: Tb1 (Terminal Block Rs422 / Rs485)
5 Conﬁguration of Hardware Using the so-called 2-wire or half-duplex mode, the signals Tx+ and Tx- are used to both transmit and receive the data. So the signals are renamed to Data+ and Data-. Half-duplex mode is only available in RS485 conﬁgurations. 5.3.2 TB1 (Terminal Block RS422 / RS485) The Terminal Block TB1 provides the common subset of RS422 and RS485 signals, i.e.
Page 11: Led
6 Conﬁguration by Software 5.5 LED There are three LED in the SER–485 PRO: LED1 is Green, it ﬂickers when SER–485 PRO receives data from the RS232 port of the PC. LED2 is Yellow, it ﬂickers when SER–485 PRO sends data to the RS232 port of the PC. LED3 is Red, it lights when power is supplied to the SER–485 PRO.
Page 12: Menu Factory Settings
6 Conﬁguration by Software VScom Converter SER-485 PRO-SI v1.2.2 www.vscom.de www.visionsystems.de Operation Modes RS-422 RS-485 controlled by RTS RS-485 controlled by DTR 4: * RS-485 controlled by ART a: * Tx switch off Delay (long, 11 bit) Tx switch off Delay (medium, 6 bit)
Page 13: Menu Configuration As Rs422
6 Conﬁguration by Software VScom Converter SER-485 PRO-SI v1.2.2 www.vscom.de www.visionsystems.de Operation Modes 1: * RS-422 RS-485 controlled by RTS RS-485 controlled by DTR RS-485 controlled by ART Cable Options Terminate Tx-lines j: * Terminate Rx-lines Polarize Tx-lines l: * Polarize...
Page 14: Rs-422
6 Conﬁguration by Software 6.1 1 – RS-422 Historically RS422 has been deﬁned before RS485, as a successor of RS232. It is much simpler to use than RS485. The transmitter is permanently active, the cabling is deﬁned as 4-wire full-duplex. There is no further option to conﬁgure.
Page 15: A - Tx Switch Off Delay (Long, 11 Bit)
6 Conﬁguration by Software Further serial speeds have been increased in the past years, so fast control is a demand. At 115200 bps a character lasts less than 0.1 millisecond, often application software does not have simple access to such precise time control. As a result some hardware automatic for control of the RS485 transmitter is required.
Page 16: D - Full Duplex (4-Wire)
6 Conﬁguration by Software 6.5.1 d – Full Duplex (4-wire) Usually RS485 is used in the so called 2-wire mode. This means data is sent and received on the same pair of wires named Data . Obviously each device can either receive or send data at a given time, so this mode is also called half-duplex.
Page 17: Polarize - Polarizerogramming Interface
6 Conﬁguration by Software 6.6.2 j – Terminate Rx-lines Option ‘j’ is similar to ‘h’, except the resistor is connected to the receive lines. This option disappears in a 2-wire mode, because the Rx-lines are not used then. 6.6.3 k – Polarize Tx-lines Option ‘k’...
Page 18: U - Firmware Update
7 Proper Cabling The conﬁguration string is seven characters long on the SER–485 PRO. The ﬁrst three positions just list the active options in upper case. The next four positions display the status of termination and polarization in lower case: the letter shows an active option, otherwise a <space> is at that position.
Page 19: Termination
7 Proper Cabling must be connected. This is often forgotten. In these cases the GND connection can be indirectly established over protective ground or over "parasite ground loops", which usually yield a bad GND connection. For these situation the correct data receiving is not reliable or not possible. 7.2 Termination When transmitted signals arrive at the end of a cable, they get reﬂected.
Page 20: 4-Wire Scheme
7 Proper Cabling Shown in ﬁgure are three devices, RS485 speciﬁes up to 32. The data lines are named as Data+ and Data-, a positive diﬀerential voltage is the state for a transmitted One. The GND is also connected between all devices as required Figure 6: 2-wire cabling scheme The resistors P1 and P2 are for polarization, T1 and T2 are for the termination function.
Page 21: Art And Polarization
8 ART and Polarization Figure 7: 4-wire cabling scheme Figure displays the wire pairs Tx and Rx as named for Devices 1 and 2. There are more slave devices, two are shown. The slaves transmit on the Rx-lines, and receive on the Tx-lines. The GND line is also connected, to implement the Common Voltage Range as speciﬁed Masters on the network are identiﬁed because they transmit on the Tx-lines.
Page 22: Art 11 Bit Delay
8 ART and Polarization When the transmission has ended, the RS232 line is in the One state. Thus the RS485 line is also in the One state, the positive polarity. ART detects this permanent condition, and deactivates the RS485 transmitter. The following is discussed for 2-wire mode, so ART controls the data direction.
Page 23: Firmware Update
9 Firmware Update 9 Firmware Update Connect the SER–485 PRO to a serial port of your PC. Open a Terminal Program for this serial port. Conﬁgure the port to 115200,8N1 as the serial parameters, and use VT100/ANSI as Emula- tion when available. Otherwise use the Emulation of a Dumb Terminal. Open the serial port with this conﬁguration.

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