Connective Peripherals ES-R-2 01B-M Series User manual

Connective Peripherals Pte Ltd
178 Paya Lebar Road, #07-03 Singapore 409030
Tel.: [phone] Fax: [phone]
E-Mail (Support): [e-mail] Web: www.connectiveperipherals.com/products
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. Connective
Peripherals Pte 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 informat ion 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. Connective Peripherals Pte Ltd, 178 Paya Lebar Road, #07-03 Singapore 409030. Registered Number: 201617872E
Copyright © Connective Peripherals Pte Ltd
The Connective Peripherals 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 serial communication in harsh environments.
This manual covers the following products:
ES-R-2001B-M
ES-R-2101B-M
ES-R-2x01B-M
RS-232 to RS-422/RS-485
Converters Manual
Document Reference No.: CP_000047
Version 1.2
Issue Date: 2019-03-25

ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual
Version 1.2
Document Reference No.: CP_000047 Clearance No.: CP#037
Copyright © Connective Peripherals Pte Ltd 2
Table of Contents
1Introduction.................................................................... 3
2Specification ................................................................... 4
3Features of the ES-R-2x01B-M ........................................ 5
3.1 Optical Isolation & Surge Protection (ES-R-2101B-M only)....... 5
3.2 Power Supply............................................................................ 5
3.3 Enclosure .................................................................................. 5
3.4 Configuring for RS-422 and RS-485 Modes ............................... 5
4Hardware Installation ..................................................... 6
4.1 General Notes and Warnings..................................................... 6
4.2 RS-232 DCE or DTE Pin Assignment .......................................... 7
4.3 RS-422 and RS-485 Mode Block Configuration .......................... 7
4.4 Termination and Biasing Configuration ..................................... 8
5Connector Pinout Information......................................... 9
5.1 RS-232 Signal Pin-outs of DB-9 Female (DTE Mode) ................. 9
5.2 RS-232 Signal Pin-outs of DB-9 Female (DCE Mode) ................. 9
5.3 RS-422 Signal Pin-out ............................................................. 10
5.4 RS-485 Signal Pin-out (half duplex) ....................................... 12
5.5 RS-485 Signal Pin-out (full duplex) ........................................ 14
6Contact Information...................................................... 16
Appendix A - List of Figures and Tables ............................. 17
List of Figures ................................................................................. 17
List of Tables ................................................................................... 17
Appendix B - Revision History............................................ 18

ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual
Version 1.2
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1Introduction
The Connective Peripherals 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 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 provide automatic data
transmit/receive control.
This manual covers the following models:
RS-232 to RS-422/RS-485 Converter (ES-R-2001B-M)
Opto-isolated RS-232 to RS-422/RS-485 Converter (ES-R-2101B-M)

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2Specification
RS-232 to RS-422/RS-485 Converter (ES-R-2001B-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
Data rate: 300 bps to 1M bps
RS-232 connector: One DB-9 female connector
RS-422 / RS-485 connector: One DB-9 male connector and one 5-pin terminal block
Auto transmit/receive control for 2-wire RS-485 half-duplex operation
Termination and bias resistors installed on-board and selectable by jumpers
RS-422 data signals : TX-, TX+, RX+, RX-, GND, RTS-, RTS+, CTS+, CTS-
RS-485 data signals (full-duplex) : TX-, TX+, RX+, RX-, GND
RS-485 data signals (half-duplex) : Data-, Data+, GND
LEDs indicate TxD and RxD
Wide input power range : 9V DC to 48V DC
Operating temperature range : –200C to 600C
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 electrostatic discharge
and power surges up to 25KV ESD
Data rate: 300 bps to 1M bps
RS-232 connector: One DB-9 female connector
RS-422 / RS-485 connector: One DB-9 male connector and one 5-pin terminal block
Auto transmit/receive control for 2-wire RS-485 half-duplex operation
Termination and bias resistors installed on-board and selectable by jumpers
RS-422 data signals : TX-, TX+, RX+, RX-, GND, RTS-, RTS+, CTS+, CTS-
RS-485 data signals (full-duplex) : TX-, TX+, RX+, RX-, GND
RS-485 data signals (half-duplex) : Data-, Data+, GND
LEDs indicate TxD and RxD
Wide input power range : 9V DC to 48V DC
Operating temperature range : –200C to 600C

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3Features of the ES-R-2x01B-M
3.1 Optical Isolation & Surge Protection (ES-R-2101B-M only)
The ES-R-2101B-M converter is optically isolated with 2000 Volt DC optical isolation. The optical isolation
protects the PC from spikes and surges on the RS-422/RS-485 network, by converting the electrical pulse
into an optical signal and then changing it back into an electrical pulse. The computer is well protected,
since the surges and spikes cannot cross the optical link.
The ES-R-2101B-M also features surge protectors, to withstand electrostatic discharge and power surges
up to 25KV ESD. The surge suppression on all signals prevents damage caused by lightning 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 converters have a metal enclosure. Transmit and Receive LEDs
are included to show when data is being transmitted or received on the serial lines. A power LED is also
included to show that the converter is receiving power.
3.4 Configuring for RS-422 and RS-485 Modes
The ES-R-2001B-M and ES-R-2101B-M converters use DIP switches to select RS-422 or RS-485 modes.
They also feature jumpers to set the pinout of the RS-232 port to a DCE or DTE configuration, and to
enable termination and biasing when required.
Please refer to section 4 for more information on the DIP switch and jumper settings available.

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4Hardware Installation
4.1 General Notes and Warnings
Serial Bus Configuration
It is important to configure the DIP switches and jumpers to select the correct type of serial bus (RS-422
or RS-485) for your application before connecting the ES-R-2x01B-M converter to your serial bus.
Otherwise damage can occur to the converter or other equipment on the bus.
To avoid damage, the power supply and serial cables should be disconnected from your converter before
changing DIP switch settings and before opening the case to change jumper settings.
Termination
For RS-422 or RS-485, it may be necessary to enable termination of the data transmission lines. This
depends on the way in which your network is connected and if termination is already provided by other
devices on the network. Before applying the termination, check your cable specification for proper
impedance matching.
Termination is normally used in the node at each end of the bus, but nodes in the middle of the bus
should not have termination enabled. The ES-R-2x01B-M converters have jumpers to allow internal
termination resistors to be enabled if required. This avoids the need to provide an external resistor at the
ES-R-2x01B-M end of the bus.
Since a computer 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 be necessary to enable biasing of the data transmission lines. In some
cases, the RS-485 lines may float to undefined levels when no transmitter is active. This can cause
additional unexpected characters to appear at the start or end of a message. Biasing resistors are used to
guarantee a defined logic level on the serial lines when no node is transmitting.
The ES-R-2x01B-M models feature internal 750 ohm resistors with jumpers to enable/disable them.
These should be disabled if another device on your serial bus already provides biasing as biasing of data
lines must only occur at a single point in the cabling. They are typically not required in RS-422 and some
RS-485 full-duplex applications since the transmitter is always enabled.
The ES-R-2x01B-M converters have four jumpers to select biasing on Tx+, Tx-, Rx+ and Rx-. For biasing
of an RS-485 half-duplex bus, enable only the Rx biasing (Pull-up Rx+ to VCC by 750 Ohm Bias resistor
and Pull-down Rx- to GND by 750 Ohm Bias resistor). The Tx biasing (Pull-up Tx+ to VCC by 750 Ohm
Bias resistor and Pull-down Tx- to GND by 750 Ohm Bias resistor) should not be enabled as this would
provide two biasing resistors per line.

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4.2 RS-232 DCE or DTE Pin Assignment
Inside the unit, there are two 2x3 (JP1, JP2) header blocks which are jumpered to select the RS-232 port
pin assignment to DCE or DTE. The factory default setting is DCE.
Jumper
Function
JP1 1-3
JP1 2-4
JP2 1-3
JP2 2-4
RS-232 port assigned to DCE (Data Communications Equipment). See
Figure 2.
JP1 3-5
JP1 4-6
JP2 3-5
JP2 4-6
RS-232 port assigned to DTE (Data Terminal Equipment). 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 application.
The RS-422 & RS-485 Mode Block Configuration Settings are shown in Table 2.
Operation Mode
S1
S2
S3
RS-422
4 wire with handshaking
ON
ON
ON
RS-485
Full Duplex (4 wire)
OFF
ON
ON
Half Duplex (2 wire)
with Echo
OFF
OFF
ON
Half Duplex (2 wire )
without Echo
OFF
OFF
OFF
Table 2 - RS-422 and RS-485 configuration
2
4
6
JP2
1
3
5
2
4
6
JP1
1
3
5

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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.
Table 3 - Termination and Biasing configuration
Note: See section 4.1 for further information before setting termination and biasing
21 20 19
3 2 1

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5Connector Pinout Information
This section shows the connector pinouts used on the ES-R-2001B-M and ES-R-2101B-M converters.
5.1 RS-232 Signal Pin-outs of DB-9 Female (DTE Mode)
When configured as a DTE, the signals are assigned as in Table 4. This mode allows a straight-through
cable to be used to connect the ES-R-2x01B-M to a DCE device.
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 (DTE)
5.2 RS-232 Signal Pin-outs of DB-9 Female (DCE Mode)
When configured as a DCE, the signals are assigned as in Table 5. This mode allows a straight-through
cable to be used to connect the ES-R-2x01B-M to a DTE device.
Pin Number
Description
1
DCD = Data Carrier Detect
2
TXD = Transmit Data
3
RXD = Receive Data
4
DSR = Data Set Ready
5
GND = RS232 signal ground
6
DTR = Data Terminal Ready
7
CTS = Clear To Send
8
RTS = Request To Send
9
No Connect
Table 5 - RS-232 Pin-Out for DB-9 connector (DCE)

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5.3 RS-422 Signal Pin-out
DB-9 Male connector
The table below shows the RS-422 pin-out of the DB-9 Male connector.
Pin Number
Description
1
TxD- = Transmit data, negative polarity
2
TxD+ = Transmit data, positive polarity
3
RxD+ = Receive data, positive polarity
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, negative polarity
2
TxD+ = Transmit data, positive polarity
3
RxD+ = Receive data, positive polarity
4
RxD- = Receive data, negative polarity
5
GND = Signal ground
Table 7 - RS-422 Pin-Out for 5-way terminal block

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Wiring diagrams
The following diagram shows an RS-422 full-duplex bus. The ES-R-2x01B-M converters have a built-in
resistor for terminating their RxD ± input, which can be enabled using a jumper. The Tx ± lines which are
outputs from the ES-R-2x01B-M are terminated at the receiver at the other end of the bus as shown.
Twisted pair wires are 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 bus as shown. Twisted pair wires are required for each
signal pair.
Figure 5 - RS-422 with handshaking signals connected
RS-422 Device
ES-R-2x01B-M
RxD+
TxD+
RxD-
TxD-
TxD+
RxD+
TxD-
RxD-
GND
GND
CTS+
RTS+
CTS-
RTS-
RTS+
CTS+
RTS-
CTS-
RS-422 Device
ES-R-2x01B-M
RxD+
TxD+
RxD-
TxD-
TxD+
RxD+
TxD-
RxD-
GND
GND

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5.4 RS-485 Signal Pin-out (half duplex)
DB-9 Male connector
The table below shows the RS-485 (half duplex) pinout of the DB-9 male connector.
Pin Number
Description
1
Data–= Transmit / Receive Data, negative polarity
2
Data+ = Transmit / Receive Data, positive polarity
5
GND = Signal ground
Table 8 - RS-485 half-duplex pin-out for DB-9 connector
Note: Other pins have no function in this mode and should be left unconnected.
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 polarity
5
GND = Signal ground
Table 9 - RS-485 half-duplex pin-out for 5-way terminal bloc
Note: Other terminals have no function in this mode and should be left unconnected.

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Wiring Diagrams
The diagram shows an ES-R-2x01B-M converter connected to an RS-485 half-duplex bus. If the ES-R-
2x01B-M is at one end of the bus (as shown), the built-in resistor can be enabled to terminate the Data
± lines. The Tx ± termination jumper is used to enable this resistor. A second termination 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 enabled if another device on the bus is already providing biasing.
Twisted pair wires are required for each signal pair.
Figure 6 - RS-485 Half Duplex Wiring
RS-485 Devices
ES-R-2x01B-M
Data+
Data-
GND
Data+
Data-
GND
Data+
Data-
GND
Data+
Data-
GND

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5.5 RS-485 Signal Pin-out (full duplex)
DB-9 Male connector
The table below shows the RS-485 (full duplex) pinout of the DB-9 male connector.
Pin Number
Description
1
TxD- = Transmit data, negative polarity
2
TxD+ = Transmit data, positive polarity
3
RxD+ = Receive data, positive polarity
4
RxD–= Receive data, negative polarity
5
GND = Signal ground
Table 10 - RS-485 full duplex pin-out for DB-9 connector
Note: Other pins have no function in this mode and should be left un-connected.
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+ = Transmit data, positive polarity
3
RxD+ = Receive data, positive polarity
4
RxD–= Receive data, negative polarity
5
GND = Signal ground
Table 11 - RS-485 full duplex pin-out for terminal block

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Wiring Diagrams
The following diagram shows an RS-485 full-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
GND

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6Contact Information
Global Headquarters –Singapore
Connective Peripherals Pte Ltd
178 Paya Lebar Road
#07-03
Singapore 409030
Tel: [phone]
Fax: [phone]
E-Mail (Sales) [email protected]
E-Mail (Support) [email protected]
Web Site URL http://www.connectiveperipherals.com
Web Shop URL http://www.connectiveperipherals.com

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Appendix A - List of Figures and Tables
List of Figures
Figure 1 - 9V DC to 48V DC power input connector ........................................................................... 5
Figure 2 - Jumpers used to select RS-232 DCE and DTE .................................................................... 7
Figure 3 - Setting termination and biasing resistors .......................................................................... 8
Figure 4 - RS-422 4 Wire Full Duplex ............................................................................................ 11
Figure 5 - RS-422 with handshaking signals connected.................................................................... 11
Figure 6 - RS-485 Half Duplex Wiring ............................................................................................ 13
Figure 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 (DTE) .......................................................................... 9
Table 5 - RS-232 Pin-Out for DB-9 connector (DCE).......................................................................... 9
Table 6 - RS-422 Pin-Out for DB-9 connector ................................................................................. 10
Table 7 - RS-422 Pin-Out for 5-way terminal block ......................................................................... 10
Table 8 - RS-485 half-duplex pin-out for DB-9 connector................................................................. 12
Table 9 - RS-485 half-duplex pin-out for 5-way terminal bloc........................................................... 12
Table 10 - RS-485 full duplex pin-out for DB-9 connector ................................................................ 14
Table 11 - RS-485 full duplex pin-out for terminal block .................................................................. 14

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Appendix B - Revision History
Revision
Changes
Date
1.0
Initial release
2011-08-24
1.1
Added temperature specification to section 2
Updated DTE and DCE definitions in sections 5.1 and 5.2
2012-01-25
1.2
Re-branding to reflect the migration of the product to
Connective Peripherals name –logo change,
copyright changed, contact information Changed, all
internal hyperlinks changed.
2019-03-25