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Note
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Section 2-6
Converter Unit Connector Specifications
The terminal block specifications of the RS-232C/RS-422A converter unit are indi-
cated here. For details on the method for making the connection cable, refer to
“Making the Cable” (page 272).
NT-AL001 RS-422A terminal block specifications
Connected terminal block RS-422A terminal block (M3 screws)
Electrical characteristics Conform to EIA RS-422A
Signal direction Signal input and output is relative to the NT-AL001.
Terminal
B
l
o
c
k
P
i
n
S
i
g
n
a
l
N
a
m
e
A
b
b
r
e
v
i
a
t
i
o
n
Signal Direction
Block Pin
No.
Signal Name Abbreviation
Input Output
8 Request to send ( ) CSA
7 Request to send ( ) CSB
6 Receive data ( ) RDA
5 Receive data ( ) RDB
4 Send data ( ) SDA
3 Send data ( ) SDB
2 Signal ground SG (GND)
1 Functional ground
* The CSA and CSB signals are for special applications.
Converter Unit Terminal Screws and Crimp Terminals
The terminal screws are M3 screws. Use M3 size crimp terminals. Tighten the ter-
minal screws with a torque of 0.5 N·m.
During wiring, crimp terminals must be used for connections.
[Recommended crimp terminals]
Fork Type Round Type
6.2mm or less 6.2mm or less
Maker Type Recommended Wire Size
Japan Solderless
Terminal MFG
1.25-N3A (Fork)
AWG22to18
(
0.3 to 0.75mm
2
)
Molex Y1.25-3.5L (Fork)
A
W
G
2
2
t
o
1
8
(
0
.
3
t
o
0
.
7
5
m
m
2
)