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Document Reference No.: ES_000086 

ES-R-2x01B-M   RS-232 to RS-422/RS-485 Converters Manual  

Version 1.0 

Clearance No.: ES

#

42 

 

 

©2010 - 2011 EasySYNC Ltd. 

8

 

4.4

 

Termination and Biasing Configuration 

Inside the converter, there is a 7x3 (21pin) header block which has jumpers to enable the Tx, Rx and 
CTS 120 Ohm termination resistors, and the Tx and Rx 750 Ohm biasing resistors. Open the case and set 
the jumpers as per the requirements of your application. The settings are detailed below. 
 
 

 

 

 

Figure 3 

Setting termination and biasing resistors 

 

Jumper 

Function 

1-2     

enable

 

2-3     

disable

 

Tx± Termination of 120 Ohm. 

This function should be enabled for RS485 Half-Duplex mode. 

4-5     

enable

 

5-6     

disable

  

Pull-up Tx+ to VCC by 750 Ohm Bias resistor.  

This function should be enabled to pull-up Tx+. 

7-8     

enable

 

8-9     

disable

 

Pull-down Tx- to GND by 750 Ohm Bias resistor.  

This function should be enabled to pull-down Tx-. 

10-11 

enable

 

11-12 

disable

 

Rx± Termination of 120 Ohm.  

This function should be enabled for RS-422 and RS485 Full-Duplex mode. 

13-14 

enable

 

14-15 

disable

 

Pull-up Rx+  to VCC by 750 Ohm Bias resistor.  

This function should be enabled to pull-up Rx+. 

16-17 

enable

 

17-18 

disable

 

Pull-down Rx- to GND by 750 Ohm Bias resistor. 

This function should be enabled to pull-down Rx-. 

19-20 

enable

 

20-21 

disable

 

CTS Termination of 120 Ohm.  

This function should be enabled for RS-422 mode. 

Note: See section 4.1 for further information before setting termination and biasing 

Table 3   

Termination and Biasing configuration 

 
 

21 20 19 

3   2   1 

Содержание ES-R-2 01B-M Series

Страница 1: ...pyright 2010 2011 EasySYNC Limited The EasySYNC ES R 2001B M and ES R 2101B M are used to convert RS 232 signals to RS 422 RS 485 signals The converters provide instant connectivity to RS 422 RS 485 communication devices for factory automation equipment multi drop data collection devices barcode readers time clocks scales data entry terminals PC to PC long distance communications up to 1 3KM and s...

Страница 2: ...r DTE Pin Assignment 7 Table 1 Jumper settings for RS 232 DCE or DTE Pin Assignment 7 4 3 RS 422 and RS 485 Mode Block Configuration 7 Table 2 RS 422 and RS 485 configuration 7 4 4 Termination and Biasing Configuration 8 Table 3 Termination and Biasing configuration 8 5 Connector Pinout Information 9 5 1 RS 232 Signal Pin outs of DB 9 Female DCE 9 5 2 RS 232 Signal Pin outs of DB 9 Female DTE 9 5 ...

Страница 3: ...llection devices barcode readers time clocks scales data entry terminals PC to PC long distance communications up to 1 3KM and serial communication in harsh environments The ES R 2001B M and ES R 2101B M provide an industrial solution for applications requiring single node or multi drop communications over short or long distances In RS 485 half duplex mode the ES R 2001B M and ES R 2101B M also pr...

Страница 4: ...ta GND LEDs indicate TxD and RxD Wide input power range 9V DC to 48V DC Opto isolated RS 232 to RS 422 RS 485 Converter ES R 2101B M Converts RS 232 port to high speed RS 422 RS 485 port RS 232 port can be selected to DCE or DTE pin assignment RS 422 RS 485 port is optically isolated with 2000 Volt DC optical isolation RS 422 RS 485 port is surge protected on all signal lines to withstand electros...

Страница 5: ...tning or high voltage 3 2 Power Supply The ES R 2001B M and ES R 2101B M accept a wide range of supply voltages from 9V DC to 48V DC The power input connector is a 3 pin terminal block style connector as shown in Figure 1 below An external switch mode power adapter is supplied with the converter Figure 1 9V DC to 48V DC power input connector 3 3 Enclosure The ES R 2001B M and ES R 2101B M converte...

Страница 6: ...r controlled serial port is normally at one end of the cable termination is enabled by default in the converter If termination is not required please disable this feature using the jumpers inside the converter ES R 2x01B M converters have jumpers for both Tx termination and Rx termination When using RS 485 half duplex only the Tx termination should be enabled Biasing For RS 485 half duplex it may ...

Страница 7: ...erminal Equipment See See Figure 2 Table 1 Jumper settings for RS 232 DCE or DTE Pin Assignment DCE setting Jumper pin numbers DTE setting Figure 2 Jumpers used to select RS 232 DCE and DTE 4 3 RS 422 and RS 485 Mode Block Configuration A 3 pin DIP switch is used to set to select the mode of operation The switches should be set to RS 422 mode or RS 485 mode as per the requirements of your applicat...

Страница 8: ...x mode 4 5 enable 5 6 disable Pull up Tx to VCC by 750 Ohm Bias resistor This function should be enabled to pull up Tx 7 8 enable 8 9 disable Pull down Tx to GND by 750 Ohm Bias resistor This function should be enabled to pull down Tx 10 11 enable 11 12 disable Rx Termination of 120 Ohm This function should be enabled for RS 422 and RS485 Full Duplex mode 13 14 enable 14 15 disable Pull up Rx to V...

Страница 9: ...l Pin outs of DB 9 Female DCE Pin Number Description 1 DCD Data Carrier Detect 2 RXD Receive Data 3 TXD Transmit Data 4 DTR Data Terminal Ready 5 GND RS232 signal ground 6 DSR Data Set Ready 7 RTS Request To Send 8 CTS Clear To Send 9 No Connect Table 4 RS 232 Pin Out for DB 9 connector DCE 5 2 RS 232 Signal Pin outs of DB 9 Female DTE Pin Number Description 1 DCD Data Carrier Detect 2 TXD Transmi...

Страница 10: ...rity 4 RxD Receive data negative polarity 5 GND Signal ground 6 RTS Request to send negative polarity 7 RTS Request to send positive polarity 8 CTS Clear to send positive polarity 9 CTS Clear to send negative polarity Table 6 RS 422 Pin Out for DB 9 connector 5 way Terminal Block The table below shows the RS 422 pin out of the 5 way terminal block Pin Number Description 1 TxD Transmit data negativ...

Страница 11: ...required for each signal pair Figure 4 RS 422 4 Wire Full Duplex The following diagram shows an RS 422 full duplex bus with handshaking signals connected The ES R 2x01B M converters have built in resistors for terminating their RxD and CTS inputs which can be enabled using jumpers The TxD and RTS lines which are outputs from the ES R 2x01B M are terminated at the receiver at the other end of the b...

Страница 12: ...mit Receive Data positive polarity 5 GND Signal ground Note Other pins have no function in this mode and should be left unconnected Table 8 RS 485 half duplex pin out for DB 9 connector 5 way Terminal Block The table below shows the RS 485 half duplex pinout of the 5 way terminal block Pin Number Description 1 Data Transmit Receive Data negative polarity 2 Data Transmit Receive Data positive polar...

Страница 13: ...rmination resistor is fitted at the other end of the bus as shown If additional unexpected zero bytes are being received the ES R 2x01B M converters also features bias resistors not shown below which can be enabled by enabling the Pull up Rx to VCC by 750 Ohm Bias resistor and Pull down Rx to GND by 750 Ohm Bias resistor jumpers For further details see sections 4 1 and 4 4 These should not be enab...

Страница 14: ...ty 3 RxD Receive data positive polarity 4 RxD Receive data negative polarity 5 GND Signal ground Note Other pins have no function in this mode and should be left un connected Table 10 RS 485 full duplex pin out for DB 9 connector 5 way Terminal Block The table below shows the RS 485 full duplex pinout of the 5 way terminal block Pin Number Description 1 TxD Transmit data negative polarity 2 TxD Tr...

Страница 15: ...ll duplex bus The ES R 2x01B M has a built in resistor for terminating its RxD input which can be enabled using a jumper The Tx lines which are outputs from the ES R 2x01B M would be terminated at the receiver at the other end of the bus as shown Twisted pair wires are required for each signal pair Figure 7 RS 485 Full Duplex Wiring RS 485 Device ES R 2x01B M RxD TxD RxD TxD TxD RxD TxD RxD GND GN...

Страница 16: ...l Sales sales easysync co uk E mail Support support easysync co uk E mail General Enquiries admin easysync co uk Web Site URL http easysync ltd com Web Shop URL http easysync ltd com Branch Office Hillsboro Oregon USA EasySYNC Limited USA 7235 NW Evergreen Parkway Suite 600 Hillsboro OR 97123 5803 USA Tel 1 503 547 0909 Fax 1 503 547 0990 E Mail Sales sales easysync ltd com E Mail Support support ...

Страница 17: ... EasySYNC disclaims all liability for system designs and for any applications assistance provided by EasySYNC Use of EasySYNC devices in life support and or safety applications is entirely at the user s risk and the user agrees to defend indemnify and hold harmless EasySYNC from any and all damages claims suits or expense resulting from such use This document is subject to change without notice No...

Страница 18: ...igure 7 RS 485 Full Duplex Wiring 15 List of Tables Table 1 Jumper settings for RS 232 DCE or DTE Pin Assignment 7 Table 2 RS 422 and RS 485 configuration 7 Table 3 Termination and Biasing configuration 8 Table 4 RS 232 Pin Out for DB 9 connector DCE 9 Table 5 RS 232 Pin Out for DB 9 connector DTE 9 Table 6 RS 422 Pin Out for DB 9 connector 10 Table 7 RS 422 Pin Out for 5 way terminal block 10 Tab...

Страница 19: ...nt Reference No ES_000086 ES R 2x01B M RS 232 to RS 422 RS 485 Converters Manual Version 1 0 Clearance No ES 42 2010 2011 EasySYNC Ltd 19 Appendix B Revision History Version 1 0 First Release 24th August 2011 ...

Страница 20: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information EasySync ES R 2001B M ES R 2101B M ...

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