FCO770 Users Guide Issue 1
Page 81
R
R
S
S
4
4
8
8
5
5
O
O
u
u
t
t
p
p
u
u
t
t
(
(
o
o
p
p
t
t
i
i
o
o
n
n
a
a
l
l
)
)
Note: RS485 connection to the instrument must be made using screened cable with the
screen connected to the chassis of the computer/PLC.
View looking at rear panel
5
4
3
2
1
5-way screw terminal
PIN
5
4
3
2
1
INPUT / OUTPUT
GND
RX B
RX A
TX B
TX A
Typical RS485 Connections
Multi-drop 4 wire RS485 system showing adaptors to connect to the RS232 ports of a PC and
other Furness Controls equipment.
PC
2xx/7xx
series instrument
1
8
2
3
3
2
4
7
5
5
8
3
2
7
5
RX A
TX B
RX B
GND
TX A
RS232
9 way D Plug
9 way D Socket
9 way D Socket
9 way D Socket
9 way D Plug
9 way D Socket
9 way D Socket
K2 Adaptor
8
3
2
7
5
RS232
RS485
RS485
RS232
7xx
series
instrument
73x series
instrument
Devices should be connected using screened twisted pair cable,
which has at least two twisted pairs. Either the screen or an
additional wire can be used to connect the ground pins.
Cables can be either looped in and out of the connectors, or
terminal boxes can be used to allow a spur to be taken from the
main cable to each device.
SW2 is ON
All other switches OFF.
K2 Adaptor
SW2 & SW3 are ON
All other switches OFF.
Screw terminals
Screw terminals
1
2
3
4
5
K2-TB Adaptor
The K2-TB adaptor uses
screw terminals instead
of a 9-way D connector to
simplify the wiring.
RX A
TX B
RX B
GND
TX A
RX A
TX B
RX B GND
TX A
RX A
TX B
RX B
GND
TX A
RX A
TX B
RX B
GND
TX A
Summary of Contents for FCO770
Page 2: ......
