Omron Programmable Terminals NT631 Setup Manual page 115

Connecting to the Host's RS-422A/485 Port
98
Setting the Rear Switches
I/O port
RS-422A
RS-232C
Synchronization
Internal
External
Terminator
OFF
ON
CTS
0 V
External
• I/O port selection (selector switch)
Set this to RS-422A.
8
7
6
SW1
5 • Unit # (DIP SW1)
4
Set SW1-1 to SW1-5 to OFF (0).
3
2
1
ON
• Synchronization (selector switch)
Set this to Internal.
8
7
6
SW2
• Communications speed
5
4
(DIP SW2-1 to SW2-4)
3
2
Set these switches to 0010 to select
1
19200 bps.
ON
Set these switches to 1010 to select
9600 bps.
(0: OFF 1: ON)
• 1-to-1/1-to-N selection (DIP SW2-6)
Set SW2-6 to OFF (0) (1-to-N).
• Instruction level (DIP SW2-7, SW2-8)
Set these switches to ON (1).
(Levels 1, 2, and 3 are enabled.)
• CTS selection (selector switch)
Set this always to 0 V (ON).
• Terminator setting (selector switch)
Set this switch to ON.
Section 5-2