GE Sensing RPT 301, User Manual

Page: 16 / 36

K177 Issue No. 3
8 RPT 301 User Manual
Communications
The installed instrument is controlled by the serial data interface.
Software or hardware handshaking can be used on the RS232 interface
and only software handshaking on the RS485 interface.
Changing the communication interface standard (Figure 2-3)
The communication interface standard is set at manufacture to RS232
but can be changed as follows:
Remove the lid of the instrument to gain access to the PCB.
C
AUTION
:
T
HE
PCB
CONTAINS SENSITIVE ELECTRONIC COMPONENTS
.
Carefully connect the interface connector lead and the link LK2 in the
following positions:
RS232
interface lead to PL1
LK2 to position A
Refit and secure the lid of the instrument.
RS485
interface lead to PL3
LK2 to position B