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33
The Terminals of the NT-Series
Section 1-5
1.5.2
Pin Assignment X3 SER1 TTY / 20 mA Current Loop
TTY / 20 mA current loop, passive
Pin
Designation
Channel
Function
10
T+
SER1
Transmit Data, Positive Polarity
13
R+
SER1
Receive Data, Positive Polarity
14
R-
SER1
Receive Data, Negative Polarity
19
T-
SER1
Transmit Data, Negative Polarity
TTY / 20 mA current loop, active
Pin
Designation
Channel
Function
10
T+
SER1
Transmit Data, Positive Polarity
12
S1+
SER1
Power Source 2, Positive Polarity
13
R+
SER1
Receive Data, Positive Polarity
14
R-
SER1
Receive Data, Negative Polarity
16
S2+
SER1
Power Source 1, Positive Polarity
19
T-
SER1
Transmit Data, Negative Polarity
21
S1-
SER1
Power Sink 1, Negative Polarity
24
S2-
SER1
Power Sink 2, Negative Polarity
Termination:
When using the channel SER1 as current loop the terminator switches for RS485
must be switched OFF!
The interface can be connected as either an active or passive current loop depend-
ing on the wiring. The transmit line and the receive line are provided with separate
20mA power sources. The compliance voltage is approximately 24 VDC.
The maximum baud rate is 19200Bd. The maximum cable length depends on the
baud rate and rate of transmission errors.
For longer cable lengths, the 20mA power supply should be fed by the transmitting
unit. This can decrease crosstalk on the signal lines considerably.
In idle state (signal logical 1) a current loop of 20 mA can be measured on the cable.
Signal logical 1
-
Current flow 20mA
Signal logical 0
-
Current flow is interrupted
A shielded cable with twisted pair wires (cable type LiYCY-TP) and a minimum
cross section of 0.08 mm
2
must be used. The maximum cable length is 100 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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