1 List for All PLCs Supported by NB Series
1-8
NB-series Programmable Terminals Host Connection Manual (V108)
• NB3Q-TWB
NB3Q-TWB has only 1 serial port COM1, and this port supports communication (non-isolated)
based on RS-232C, RS-422 and RS-485, of which only 1 connection mode can be applied at one
time. By means of the RS-232C mode (PIN 2~5), it can be connected to a controller based on RS-
232C, and can also be used for downloading programs, as well as debugging for the product
(connected to a PC). While with the RS-422 or the RS-485 mode (PIN 1, PIN 6~8), only a PLC can
be connected.
The pins are defined as follows:
Precaution for Cable Fabrication
The COM 2 ports included in this manual and marked by cable manufacturers are intended for the
PT of NB5Q/NB7W/NB10W-TWB models, therefore when communication connection is carried
out with the COM 1 port of NB3Q-TWB, please refer to the pin definitions in this section prior to
connection.
Serial Port COM2
• NB5Q/NB7W/NB10W-TWB
Serial port COM2 is a 9-pin D-type socket port. This port supports RS-232C/RS-485/RS-422A
communication function.
The pins are defined as follows:
* Pin 4 and 5 are not used, thus not compliant with RS or CS function.
Pins Signals I/O
Functions
RS-232C RS-485 RS-422A
1 SDB+ I/O - - Sending data(+)
2 SD O Sending data - -
3 RD I Receiving data - -
4 RS(RTS) O Request to send* - -
5 CS(CTS) I Clear to send* - -
6RDB+I/O - RS485B
Send/Receive
data(+)
Receiving
data(+)
7 SDA- I/O - - Sending data(-)
8RDA- I/O - RS485A
Send/Receive
data(-)
Receiving
data(-)
9 SG - Signal ground
Pins Signals I/O
Functions
RS-232C RS-485 RS-422A
1 SDB+ I/O - - Sending data(+)
2 SD O Sending data - -
3 RD I Receiving data - -
4 Terminal R1 - - Terminal resistor
5 Terminal R2 - - Terminal resistor
6 RDB+ I/O - Send/Receive
data(+)
Receiving
data(+)
7 SDA- I/O - - Sending data(-)
8 RDA- I/O - Send/Receive
data(-)
Receiving
data(-)
9 SG - Signal ground
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