Document Reference No.: ES_000086

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

Version 1.0

Clearance No.: ES

©2010 - 2011 EasySYNC Ltd.

7

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 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

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