EasySync ES-R-2 01-M Series User manual

EasySync Ltd
Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom
Tel.: [phone] Fax: + 44 (0) 141 418 0110
E-Mail (Support): [e-mail] Web: http://www.easysync.co.uk
Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced
in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are
supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. EasySync Ltd will
not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected.
This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product
might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to
change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document.
EasySync Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom. Scotland Registered Number:
SC224924
Copyright © 2008 EasySync Limited
The ES-R-2001-M and ES-R-2101-M provide a simple method of converting RS232 signals to RS422
or RS485 differential signals.
Flexible mounting options allow the ES-R-2001-M and ES-R-2101-M to be used in a variety of
applications. Indicator LEDs provide functional status.
EasySync Ltd
ES-R-2x01-M RS232 to RS422 / RS485
Converter
User Guide
Document Reference No.: ES_000011
Version draft
Issue Date: 2009-04-10
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Document Reference No.: ES_000011
ES-R-2x01-M RS232 to RS422 / RS485 Converter User Guide
Version draft
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©2009 EasySync Ltd. 2
1Introduction................................................................................... 4
1.1 Functional Description .................................................................................. 4
1.2 LED Description............................................................................................. 4
1.3 Features........................................................................................................ 4
1.4 Performance Figures..................................................................................... 4
1.5 Ordering Information.................................................................................... 5
2Installation..................................................................................... 6
2.1 Hardware Installation................................................................................... 6
2.1.1 Communications Mode ............................................................................... 6
2.1.2 Internal Jumpers....................................................................................... 6
2.1.3 RS422/RS485 Interface Configuration.......................................................... 7
2.1.4 Slew Rate Configuration............................................................................. 8
2.1.5 RS232 Interface Configuration .................................................................... 9
2.1.6 DC-IN Connector......................................................................................10
2.2 Mounting..................................................................................................... 11
3Connections.................................................................................. 12
3.1 RS422 Signal Wiring ................................................................................... 12
3.1.1 RS422 Four-wire full-duplex ......................................................................12
3.1.2 RS422 Four-wire full-duplex with handshaking.............................................12
3.2 RS485 Signal Wiring ................................................................................... 13
3.2.1 RS485 Two-wire half-duplex ......................................................................13
3.2.2 RS485 Four-wire full-duplex ......................................................................13
4Electrical details........................................................................... 14
4.1 Input Power................................................................................................ 14
5Mechanical Details........................................................................ 15
5.1 Module Mechanical Dimensions................................................................... 15
6Physical Environment Details ....................................................... 16
6.1 Storage ....................................................................................................... 16
6.2 Operating.................................................................................................... 16
7Environmental Approvals & Declarations...................................... 17
7.1 EMI Compatibility........................................................................................ 17
7.2 Safety ......................................................................................................... 17
7.3 Environmental............................................................................................. 17
7.4 Reliability.................................................................................................... 17
7.4.1 MTTF ......................................................................................................18
7.5 Import / Export Information....................................................................... 18
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Technical Support ................................................................................................. 19
8Contact Information..................................................................... 20
Appendix A - List of Figures and Tables ............................................. 21
Appendix B - Revision History............................................................ 22
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1Introduction
1.1 Functional Description
The ES-R-2001-M and ES-R-2101-M are RS232 to RS485 / RS422 adapters that support transfer rates up
to 1M baud. The two models are identical, except that the ES-R-2101-M includes optical isolation
between the RS232 and RS422 / RS485 connections.
With RS422 mode selected the interface can be configured for four-wire operation with CTS / RTS
hardware handshaking. In RS422 mode the transmitter is always on.
With RS485 mode selected the interface can be configured for four-wire full duplex operation or two-wire
half duplex operation with optional echo back. The transmitter enable is controlled automatically with a
turn-around delay of less than 20us.
Optional RS422 / RS485 termination and bias resistors can also be configured.
The RS232 interface on the ES-R-2x01-M can be configured to be a DCE or a DTE type. The default link
settings select a DCE type which allows use of a straight-through DE-9S to DE-9P cable.
1.2 LED Description
The ES-R-2x01-M uses three LEDs to indicate power and data activity. The table below defines the LED
functions.
LED Colour Function Description
Yellow Power Power is being supplied to “DC-IN”
Green TxD Shows data activity from RS232 to RS422 / RS485
Red RxD Shows data activity from RS422 / RS485 to RS232
Table 1.1 – LED Description
1.3 Features
•Converts RS232 signals to RS422 or RS485 differential signals
•Easy installation
•Power supply provided
•ES-R-2101-M provides TBD KV of optical isolation, including power supply
•Metal case with mounting tabs
•Optional DIN rail clips
•DE-9P connector and screw terminals for a variety of RS422 and RS485 connections
•Termination available through jumpers inside case
1.4 Performance Figures
Parameter Performance
Asynchronous Speed Up to 1Mbps
Table 1.2 – Performance Figures
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1.5 Ordering Information
Part Number Description
ES-R-2001-M RS232 to RS422 / RS485 Asynchronous Serial Converter
ES-R-2101-M RS232 to RS422 / RS485 Asynchronous Serial Converter with Optical Isolation
Table 1.3 – Ordering Information
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2Installation
2.1 Hardware Installation
2.1.1 Communications Mode
Switch SW selects the communications mode.
S1 S2 S3 Function
ON ON ON RS422 Mode. Four-wire mode with transmitter always on.
ON ON OFF RS485 Full Duplex. Four-wire mode with automatic TX enable
OFF OFF ON RS485 Half Duplex with echo back. Two-wire mode.
OFF OFF OFF RS485 Half Duplex (no echo). Two-wire mode.
Table 2.1 – Communications Mode Selection Switch
2.1.2 Internal Jumpers
There are four sets of internal jumpers within the ES-R-2x01-M that can be accessed by removing the
two screws from the side of the unit and removing the top cover. The following figure shows the location
of the internal jumpers JP1, JP2, JP5 and JP6.
JP2
1
12
13 14
JP1
JP5
JP6
12
56
12
56
DC IN
3
SW
RS232 RS485
PWR
TxD
RxD
12345
Figure 2.1 – ES-R-2x01-M Jumper Layout
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2.1.3 RS422/RS485 Interface Configuration
The RS422/485 connector is a 9-way D-Type plug (DE-9P) that provides connection to up to four
differential signal pairs.
DE-9P Pin Name Comments
1 TxD-(A)
2 TxD+ (B)
3 RxD+ (B) Not used in two-wire mode
4 RxD-(A) Not used in two-wire mode
5 GND (C)
6 RTS-(A) Output. RS422 handshake
7 RTS+ (B) Output. RS422 handshake
8 CTS+ (B) Input. RS422 handshake
9 CTS-(A) Input. RS422 handshake
Table 2.2 – RS422/RS485 DE-9P Pin-Out
The screw terminal block provides access to the first five signals on the RS422/485 connector.
Pin Name Comments
1 TxD-(A)
2 TxD+ (B)
3 RxD+ (B) Not used in two-wire mode
4 RxD-(A) Not used in two-wire mode
5 GND (C)
Table 2.3 – RS422/RS485 Screw Terminal Pin-Out
The internal Jumper JP1 provides seven possible link settings to set the function of the RS422/485
interface.
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JP1 Links RS422/RS485 Function
1 2 Fit for 120R termination between TxD- and TxD+
3 4 Fit for 750R pull-up bias on TxD+
5 6 Fit for 750R pull-down bias on TxD-
7 8 Fit for 120R termination between RxD- and RxD+
9 10 Fit for 750R pull-up bias on RxD+
11 12 Fit for 750R pull-down bias on RxD-
13 14 Fit for 120R termination between CTS- and CTS+
Table 2.4 – JP1 Termination and Bias Configuration Jumper
The factory setting is for no JP1 links to be fitted.
The need for termination depends on the baud rate and the propagation delay of the cable. A reasonable
rule of thumb is that no termination is required if the cable return trip delay is less that the bit time / 6.
For example, 1000m of cable with a propagation delay of 70% (of speed of light) will have a return trip
delay of 6.7us. The bit time for a baud rate of 9600 is approximately 100us therefore it is reasonable to
assume that any edge reflections have reduced to an insignificant level when the receiver samples the
data in the middle of the bit time.
Termination is only fitted to the receiving end of the link if it is required.
In a RS485 two-wire interface, termination may be required on both ends of the link, as each end has a
receiver, and is activated by fitting a link between JP1 pins 1 and 2.
In a RS485 four-wire interface termination may be required on the receiver and is activated by fitting a
link between JP1 pins 7 and 8. No link would be fitted across JP1 pins 1 and 2.
Bias resistors may be necessary to set a defined logic level at a receiver when the connected transmitter
is not enabled. Bias resistors are not required for a RS422 interface as the transmitter is always on.
The RS422/RS485 transceivers used on the ES-R-2x01-M feature fail-safe circuitry to guarantee a logic-
high receiver output if the receiver inputs are not connected. Therefore it will not normally be necessary
to fit any of the bias resistor options.
2.1.4 Slew Rate Configuration
Jumper JP2 selects the slew rate limit on the RS422/RS485 driver. Select the lowest value that is
consistent with the intended baud rate. The factory setting is to link pins 2 to 3 to select a slew rate that
supports up to 10M bits/s. Note that the maximum data rate of the ES-R-2x01-M is limited to 1Mbps by
the RS232 transceivers.
JP2 Slew Rate Limit
Link 1 – 2 500k bits per second
Link 2 – 3 10M bits per second. Factory Setting.
No link fitted 115k bits per second
Table 2.5 – JP2 RS422/RS485 Slew Rate Configuration Jumper
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2.1.5 RS232 Interface Configuration
The RS232 connector is a 9-way D-Type socket (DE-9S) that can be configured as a DCE or a DTE using
internal jumpers JP5 and JP6.
2.1.5.1 DCE Configuration
The factory settings for JP5 and JP6 select a DCE type RS232 interface that results in the 9-way RS232
D-Type socket having the following pin-out and signal directions.
DE-9S Pin Name Comment
1 DCD Linked to pin 4 and pin 6
2 Rx (Out) An output pin for DCE type RS232 interface
3 Tx (In) An input pin for DCE type RS232 interface
4 DTR Linked to pin 1 and pin 6
5 GND GND
6 DSR Linked to pin 1 and pin 4
7 RTS (In) An input pin for DCE type RS232 interface
8 CTS (Out) An output pin for DCE type RS232 interface
9 No connection
Shield Shield No connection
Table 2.6 – RS232 DE-9S DCE Pin-Out (Default)
To select the DCE configuration fit links between the following pins on JP5 and JP6.
JP5 DCE Selection
Link pins 1 – 3
Link pins 2 – 4
JP6 DCE Selection
Link pins 1 – 3
Link pins 2 – 4
Table 2.7 – JP5 & JP6 DTE-DCE Configuration Jumper – Set for DCE
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2.1.5.2 DTE Configuration
The RS232 interface can be configured as a DTE type interface. A DTE type RS232 interface results in the
9-way RS232 D-Type socket having the following pin-out and signal directions.
DE-9S Pin Name Comment
1 DCD Linked to pin 4 and pin 6
2 Rx (In) An input pin for DTE type RS232 interface
3 Tx (Out) An output pin for DTE type RS232 interface
4 DTR Linked to pin 1 and pin 6
5 GND GND
6 DSR Linked to pin 1 and pin 4
7 RTS (Out) An output pin for DTE type RS232 interface
8 CTS (In) An input pin for DTE type RS232 interface
9 No connection
Shield Shield No connection
Table 2.8 – RS232 DE-9S DTE Pin-Out
To select the DTE configuration fit links between the following pins on JP5 and JP6.
JP5 DTE Selection
Link pins 3 – 5
Link pins 4 – 6
JP6 DTE Selection
Link pins 3 – 5
Link pins 4 – 6
Table 2.9 – JP5 & JP6 DTE-DCE Configuration Jumper – Set for DTE
2.1.6 DC-IN Connector
The ES-R-2x01-M is supplied with an external +5V, 10W DC power supply. It is recommended that the
ES-R-2x01-M is only used with this power supply.
If an alternative power supply is used it must be a +5V +/-5% DC supply capable of providing at least
1A. The DC-IN connector accepts a DC Jack with a 2.1mm pin and a 5.5mm barrel with +5V on the
centre pin. There is no reverse voltage protection.
The Yellow PWR LED is illuminated when power is applied to the ES-R-2x01-M.
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2.2 Mounting
The ES-R-2x01-M is supplied with rubber feet for desktop use. In addition, the case has integrated
mounting flanges that can be used for securing to a flat surface. The flange holes are spaced to attach to
an optional DIN-rail bracket clip.
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3Connections
3.1 RS422 Signal Wiring
3.1.1 RS422 Four-wire full-duplex
ES-R-2x01-M Direction RS422 Device
1 TxD-(A)

RxD-(A)
2 TxD+ (B)

RxD+ (B)
3 RxD+ (B)

TxD+ (B)
4 RxD-(A)

TxD-(A)
5 GND (C)

GND (C)
Table 3.1 – RS422 Wiring – Full Duplex Without Handshake
3.1.2 RS422 Four-wire full-duplex with handshaking
ES-R-2x01-M Direction RS422 Device
1 TxD-(A)

RxD-(A)
2 TxD+ (B)

RxD+ (B)
3 RxD+ (B)

TxD+ (B)
4 RxD-(A)

TxD-(A)
5 GND (C)

GND (C)
6 RTS-(A)

CTS-(A)
7 RTS+ (B)

CTS+ (B)
8 CTS+ (B)

RTS+ (B)
9 CTS-(A)

RTS-(A)
Table 3.2 – RS422 Wiring – Full Duplex With Handshake
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3.2 RS485 Signal Wiring
3.2.1 RS485 Two-wire half-duplex
ES-R-2x01-M Direction RS485 Device/s1
1 TxD-(A)

Data-(A)
2 TxD+ (B)

Data+ (B)
5 GND (C)

GND (C)
Table 3.3 – RS485 Wiring – Half Duplex
3.2.2 RS485 Four-wire full-duplex
ES-R-2x01-M Direction RS485 Device/s2
1 TxD-(A)

RxD-(A)
2 TxD+ (B)

RxD+ (B)
3 RxD+ (B)

TxD+ (B)
4 RxD-(A)

TxD-(A)
5 GND (C)

GND (C)
Table 3.4 – RS485 Wiring – Full Duplex
1Can be multiple RS485 devices sharing the same wiring
2Can be multiple RS485 devices sharing the same wiring
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4Electrical details
4.1 Input Power
Parameter Description Minimum Typical Maximum Units Conditions
DC-IN Input Power Voltage 4.75 5.0* 5.25 V
Icc Input current TBD TBD mA
Table 4.1 – Input Power Electrical Details
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5Mechanical Details
5.1 Module Mechanical Dimensions
TBD
Figure 5.1 – ES-R-2x01-M Case Dimensions
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6Physical Environment Details
6.1 Storage
Parameter Description Minimum Typical Maximum Units Conditions
T Storage Temperature
Range TBD TBD oC
Table 6.1 – Storage Temperature
6.2 Operating
Parameter Description Minimum Typical Maximum Units Conditions
T Operating
Temperature Range 0 +60 oC 5% to 95% RH, non condensing
Table 6.2 – Operating Temperature
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7Environmental Approvals & Declarations
7.1 EMI Compatibility
FCC and CE
The ES-R-2001-M and ES-R-2101-M have been tested to be compliant with both FCC Part 15 Subpart B
and European EMC Directive.
NOTE: This is a Class B product. In a domestic environment, this product may cause radio interference,
in which case the user may be required to take adequate measures.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
•Consult the dealer or an experienced radio/TV technician for help.
7.2 Safety
The ES-R-2001-M and ES-R-2101-M are defined as Limited Power Supply (LPS) devices, with operating
voltages under 60VDC.
7.3 Environmental
The ES-R-2001-M and ES-R-2101-M are lead-free devices that comply with the following environmental
directives: RoHS, WEEE, REACH, PFOS and DecaBDE.
7.4 Reliability
The ES-R-2001-M and ES-R-2101-M are designed as robust RS232 to RS422/RS485 adapters for use in
many environments. There are no user-serviceable parts. Any failure will require a replacement of the
unit.
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7.4.1 MTTF
The Mean Time To Failure is TBD.
7.5 Import / Export Information
Import / Export Information
Country of Origin China
Harmonized Code 8471.80.1000
Product Description RS232 to RS422/RS485 Computer Adapter, Single Port
USA ECCN EAR99 – No License Required
Table 7.1 – Import / Export Information
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Technical Support
Technical support may be obtained from your nearest EasySync office:
United Kingdom: [email protected]
United States: [e-mail]
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8Contact Information
Head Office – Glasgow, UK
EasySync Limited
Unit 1, 2 Seaward Place,
Centurion Business Park
Glasgow, G41 1HH
United Kingdom
Tel: [phone]
Fax: [phone]
E-mail (Sales) [email protected]
E-mail (Support) [email protected]
E-mail (General Enquiries) [email protected]
Web Site URL http://easysync.co.uk
Web Shop URL http://easysync.co.uk
Branch Office – Hillsboro, Oregon, USA
EasySync Limited (USA)
7235 NW Evergreen Parkway, Suite 600
Hillsboro, OR 97123-5803
USA
Tel: [phone]
Fax: [phone]
E-Mail (Sales) [e-mail]
E-Mail (Support) [e-mail]
E-Mail (General Inquiries) [e-mail]
Web Site URL http://easysync-ltd.com
Web Shop URL http://easysync-ltd.com
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