2 Installing the NB Unit and Connecting Peripheral Devices
2-12
NB-series Programmable Terminals Setup Manual(V107)
Communication setting
The communication settings need to be set as following values before carrying out communications in
the Use Host link.
At the NB Unit side, these settings are made through the PT menu of the NB-Designer. For details, refer
to 3-10-8 COM1/COM2 Setting in the NB-Designer Operation Manual.
For communication settings at the host side, refer to the related PLC manuals as needed.
Select the RS-232C method for COM1, and one from RS-232C, RS-422A and RS-485 for COM2
(NB3Q-TWB is not equipped with serial port COM2.).
PT with the model number of NB-TW01B, which supports Ethernet, can connect single PLC or
multiple PLCs simultaneously through the Ethernet (through the router). When connecting with multiple
PLCs, it can connect the Host manufactured by the same manufacture or different manufactures
simultaneously. (Note: At a certain time, only one from RS-232C, RS-422A and RS-485 can be
designated for COM2 to perform communications.)
The example of NB5Q/NB7W/NB10W-TW01B connecting with 3 PLCs simultaneously is as shown
below:
Precautions for Safe Use
• Always keep the connector screws firmly tightened after the communication cable is
connected.
• The maximum tensile load for cables is 30N. Do not apply loads greater than this.
• The communication cables of the COM1 and COM2 connectors are not interchangeable.
Confirm the pins of the ports before carrying out communications.
Items Settings
Data bit 7bit
Stop bit 2bit
Parity check Even
Communication speed Any value, but the values for the NB Unit and the host must be the same.
Connected Unit No. 00
2-4-2 Connecting more than one PLC
COM1 RS-232C cable
Ethernet cable
COM2 RS-232C/422A/485 cable
NB Unit
NB Unit 1
NB Unit 2
NB Unit 3
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