1 List for All PLCs Supported by NB Series • NB3Q-TW B NB3Q-TW B 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: * Pin 4 and 5 are not used, thus not compliant with RS or CS function.
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-TW B models, therefore when communication connection is carried out with the COM 1 port of NB3Q-TW B, please refer to the pin definitions in this section prior to connection. Serial Port COM2 • NB5Q/NB7W/NB10W-TW B 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:
1-8 NB-series Programmable Terminals Host Connection Manual (V108) 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* - - 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 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