15
Communication Specifications
Use NX_CBLCPU2 or NX_CBLCPU5 cable from your personal computer's
serial port to COM1 port. See
NX7 Controllers User Manual
for more
information about wiring.
Item
Specifications
Remarks
Interface
COM1: RS-232C or RS-485, 9-pin D-Sub
DIP switch
COM2: RS-232C or RS-485, 8-pin modular
Automatically recognized (wiring
method)
Baud rate
38400, 19200, 9600, and 4800,
automatically selected
(But, the speed is limited for COM2
user-defined communications)
Reset after pausing
communication, for more than
one minute, to change the speed.
Protocol
Half duplex asynchronous polling
Data bit
8 bits
Parity
None
Stop bit
1 bit
Communication
distance
RS-232: 15 m or less, RS-485: 1.2 Km or
less
Termination
resistance
COM1: adjusted by the internal DIP switch
COM2: external user wiring
(150 recommended)
Transmission cable Twisted pair cable (Shielded cable)
COM1 comm. port
9-pin female
D-Sub
COM2 comm.
port 8-pin
female RJ45
Status LED
(Flashes during communication)
COM1 switch settings
RS232/RS485
selector switch
Termination
resistence setting switch
No
Signal
1
485+
2
485-
3
485+
4
485-
5
Reserved
6
Signal GND
7
232C/RXD
8
232C/TXD
IMPORTANT
PLC Port1 (CoM1)
(9-pin female D-sub)
PLC Port2 (CoM2)
(8-pin female RJ45)
1
NC
2
TXD
3
RXD
4
RTS
5
GND
6
485-
7
485+
8
CTS
9
Vcc
The terminals #1 and #3, and
#2 and #4 are connected
internally, respectively
