Document Reference No.: ES_000011
ES-R-2x01-M RS232 to RS422 / RS485 Converter User Guide
Version draft
Clearance No.: ES#*
*****
©2009 EasySync Ltd.
6
2
Installation
2.1
Hardware Installation
2.1.1
Communications Mode
Switch SW selects the communications mode.
S1
S2
S3
Function
ON
ON
ON
RS422 Mode. Four-wire mode with transmitter always on.
ON
ON
OFF
RS485 Full Duplex. Four-wire mode with automatic TX enable
OFF
OFF
ON
RS485 Half Duplex with echo back. Two-wire mode.
OFF
OFF
OFF
RS485 Half Duplex (no echo). Two-wire mode.
Table 2.1 – Communications Mode Selection Switch
2.1.2
Internal Jumpers
There are four sets of internal jumpers within the ES-R-2x01-M that can be accessed by removing the
two screws from the side of the unit and removing the top cover. The following figure shows the location
of the internal jumpers JP1, JP2, JP5 and JP6.
JP2
1
1
2
13
14
JP1
JP5
JP6
1
2
5
6
1
2
5
6
DC IN
3
SW
RS232
RS485
PWR
TxD
RxD
1
2
3
4
5
Figure 2.1 – ES-R-2x01-M Jumper Layout
Preliminary
