Document Reference No.: ES_000086
ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual
Version 1.0
Clearance No.: ES
#
42
©2010 - 2011 EasySYNC Ltd.
7
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 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