1-7
1 Part Names and Functions
NB-series Programmable Terminals Setup Manual(V107)
1-2 Part Specifications
1
Precautions for Safe Use
When using the No. 6 pin of the serial communications port COM1 connector for a voltage of
DC+5V, make sure the supply equipment’s current capacity is below 250 mA before using it. The
DC+5V voltage output of the NB Unit is +5V±5%, and the maximum current is 250 mA.
• NB3Q-TWB
NB3Q-TWB has only 1 serial port COM1, and this port supports communication 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:
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:
* Pins 4 and 5 are not used, thus not compliant with RS or CS functions.
Pins Signals I/O
Functions
RS-232C RS-485 RS-422A
1 SDB+ I/O - - Sending data(+)
2SD O
PLC Sending data
--
3RD I
PLC Receiving data
--
4 RS(RTS) O
Request to send*
--
5 CS(CTS) I Clear to send* - -
6 RDB+ I/O - RS485B
Send/Receive
data(+)
Receiving
data(+)
7 SDA- I/O - - Sending data(-)
8 RDA- 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 1
5 Terminal R2 - - Terminal resistor 2
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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