34
The Terminals of the NT-Series
Section 1-5
1.5.3
Pin Assignment X3 SER1 RS485
The interface RS485 is suitable for point-to-point connections and multipoint con-
nections.
Termination for point-to-point connection:
For operation with point-to-point connection the termination must always be acti-
vated.
Termination for multipoint connection:
For operation with multipoint connections only the termination at the cable end
must be activated.
The signals of the interface are electrically isolated.
The configuration of the hardware can be adapted to different systems. The associ-
ated wires are marked with ‘A’ and ‘B’. Some descriptions refer to the pins with ‘+’
and ‘-’, where the following applies: A = + and B = -. The voltage levels comply with
the standards and are defined as follows:
Signal logical 1
-
U
A
- U
B
,
= -0.3 V
i.e. (U
A
,
U
B
)
Signal logical 0
-
U
A
- U
B
.
= +0.3 V
i.e. (U
A
.
U
B
)
Pin
Designation
Channel
Function
8
T(A)
SER1
Transmit Data Channel A
9
T(B)
SER1
Transmit Data Channel B
11
SGND
SER1
Signal Ground
22
RD(A)
SER1
Receive Data Channel A
23
RD(B)
SER1
Receive Data Channel B
A shielded cable with twisted pair wires (cable type LiYCY-TP) and a minimum
cross section of 0.34 mm
2
(for 400 m) must be used. The maximum cable length is
400 m.
Connect the cable shield to the metal hoods of the connectors over as large a
surface as possible!
Summary of Contents for NT15S
Page 1: ...Cat No V056 E1 1 Programmable Terminal NT4S NT15S NT18S OPERATION MANUAL ...
Page 2: ...ii ...
Page 3: ...iii NT4S NT15S NT18S Programmable Terminal Operation Manual Produced March 1999 ...
Page 4: ...iv ...
Page 6: ...vi ...
Page 14: ...xiv ...
Page 26: ...12 The Terminals of the NT Series Section 1 2 1 2 4 1 2 NT4S SF122B E 1 2 4 1 3 NT4S SF123B E ...
Page 37: ...23 The Terminals of the NT Series Section 1 4 1 4 1 3 NT4S SF123B E 1 4 1 4 NT15S SF121B E ...
Page 54: ...40 The Terminals of the NT Series Section 1 7 1 7 6 3 ASCII Character Set Table ...
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