1 Part Names and Functions 1-2 Part Specifications 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-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: * Pins 4 and 5 are not used, thus not compliant with RS or CS functions.
Precaution for Cable Fabrication The COM2 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 COM1 port of NB3Q-TW B, please refer to the pin definitions in this section prior to connection.
NB-series Programmable Terminals Setup Manual(V107) 1-7 1 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