FX70 Supervisory Controller Installation Instructions
11
Note:
If rebooted with the mode jumper in the Serial
Shell position (see Figure 6), the RS-232 port provides
system shell access. Refer to the
JACE Niagara
AX
Install and Startup Guide
(in the docs folder in FX
Workbench) for related details.
RS-485
An RS-485 optically isolated port is available on three
pins of the 6-position right-side connector, and always
operates as COM2. As shown in Table 3, the screw
terminals are minus (–), plus (+), and shield. Wire in a
continuous multidrop fashion to other RS-485 devices,
meaning minus-to-minus, plus-to-plus, and shield-to-
shield. Connect the shield to earth ground at one end
only (such as the FX70).
Table 3: Serial Port (RS-232 and RS-485) Pinouts
Base RS-232 DB-9 Port (COM1)
Base RS-485 Port (COM2)
Pinout Reference
Signal
DB-9
Pin
Pinouts
DB-9 Plug (male)
DCD
Data carrier detect
1
6-Position end connector (male)
RXD
Receive data
2
TXD
Transmit data
3
DTR
Data terminal ready
4
GND
Ground
5
DSR
Data set ready
6
RTS
Request to send
7
CTS
Clear to send
8
not used on the FX70
9
