ES-R-2101B-M EasySync, ES-R-2101B-M Datasheet - Page 8

• Manufacturer Part Number: ES-R-2101B-M
• Description: RS-232 Interface IC RS232 to 1 Prt RS458 /RS485, Metal, Isltd
• Manufacturer: EasySync

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19-20
20-21
4.4
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.
Jumper
enable
disable
enable
disable
enable
disable
enable
disable
enable
disable
enable
disable
enable
disable
Termination and Biasing Configuration
Note: See section 4.1 for further information before setting termination and biasing
Tx± Termination of 120 Ohm.
This function should be enabled for RS485 Half-Duplex mode.
Pull-up Tx+ to VCC by 750 Ohm Bias resistor.
This function should be enabled to pull-up Tx+.
Pull-down Tx- to GND by 750 Ohm Bias resistor.
This function should be enabled to pull-down Tx-.
Rx± Termination of 120 Ohm.
This function should be enabled for RS-422 and RS485 Full-Duplex mode.
Pull-up Rx+ to VCC by 750 Ohm Bias resistor.
This function should be enabled to pull-up Rx+.
Pull-down Rx- to GND by 750 Ohm Bias resistor.
This function should be enabled to pull-down Rx-.
CTS Termination of 120 Ohm.
This function should be enabled for RS-422 mode.
Figure 3
Table 3
©2010 - 2011 EasySYNC Ltd.
Setting termination and biasing resistors
ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual
21 20 19
3
Termination and Biasing configuration
2
1
Function
Document Reference No.: ES_000086
Clearance No.: ES
Version 1.0
#
42
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