ES-R-2X01B-M Datasheet, PDF (8/20 Pages) List of Unclassifed Manufacturers – Converters Manual

ES-R-2x01B-M
Document Reference No.: ES_000086
RS-232 to RS-422/RS-485 Converters Manual
Version 1.0
Clearance No.: ES#42
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.
21 20 19
Figure 3
321
Setting termination and biasing resistors
Jumper
Function
1-2 enable Tx± Termination of 120 Ohm.
2-3 disable This function should be enabled for RS485 Half-Duplex mode.
4-5 enable Pull-up Tx+ to VCC by 750 Ohm Bias resistor.
5-6 disable This function should be enabled to pull-up Tx+.
7-8 enable Pull-down Tx- to GND by 750 Ohm Bias resistor.
8-9 disable This function should be enabled to pull-down Tx-.
10-11 enable Rx± Termination of 120 Ohm.
11-12 disable This function should be enabled for RS-422 and RS485 Full-Duplex mode.
13-14 enable Pull-up Rx+ to VCC by 750 Ohm Bias resistor.
14-15 disable This function should be enabled to pull-up Rx+.
16-17 enable Pull-down Rx- to GND by 750 Ohm Bias resistor.
17-18 disable This function should be enabled to pull-down Rx-.
19-20 enable CTS Termination of 120 Ohm.
20-21 disable 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
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