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2-7
Section
Connection to a PC by the NT Link (1:N)
51
Wiring Method and Settings Relating to Wiring
The wiring method for the connections between the PC and NT620S/NT620C
units, and the settings of each piece of equipment related to wiring, are described
here. The wiring method and settings to be made depend on the type of cable
(RS-422A or RS-485), as shown below.
S
RS-422A Cables
When using RS-422A cables, note the following points.
- The wiring method for RS-422A cables is different for the connection closest
to the PC than for other connections. Follow the instructions below in order to
complete the wiring correctly.
- Always set a terminal resistor (terminator) at both ends of the RS-422A
cable. Do not set terminal resistors at any other positions.
- When equipment has functional ground terminals, always connect the
shielding of the RS-422A cable to these terminals.
- Always use an RS-232C/RS-422A converter unit (NT-AL001) to make a con-
nection between an NT620S/NT620C and an RS-422A cable.
The actual wiring and settings depend on the system configuration, as shown
below.
[When the PC is RS-232C]
PC
(RS-232C)
NT-
AL001
No terminal
resistor
Terminal
resistor set
RS-422A
cable (2)
Same settings for same equipment
RS-232C
cable
RS-232C cable
RS-422A cable (2)
Terminal
resistor set
RS-232C
cable
NT-
AL001
NT620S/
NT620C
NT620S/
NT620C
NT-
AL001
RS-422A cable (1)
[When the PC is RS-422A]
PC
(RS-422A)
No terminal
resistor
(Communication port)
RS-422A
cable (2)
Same settings for same equipment
RS-232C
cable
RS-422A cable (2)
Terminal
resistor set
RS-232C
cable
NT-
AL001
NT620S/
NT620C
NT620S/
NT620C
NT-
AL001
RS-422A cable (1)
Terminal resistor set
Содержание NT620C
Страница 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Страница 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Страница 3: ...iv...
Страница 5: ...vi...
Страница 326: ...Appendix K Option List 325 Battery 3G2A9 BAT08 This is a lithium battery used for memory backup...
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