ABB 23WT25 User manual

2019-12-19 1/20
—
1KGT151085, D EC EM B ER 19TH, 2019
Application Note
Connecting 23WT25 or 500FSD20
to NSK5

2019-12-19 2/20
Table of Content
1Introduction ................................................................................................................................3
1.1 Motivation .....................................................................................................................................3
1.2 Modulation ....................................................................................................................................3
2Configuration ............................................................................................................................. 4
2.1 Setup.............................................................................................................................................. 4
2.2 Supported channels and frequencies .....................................................................................5
2.3 Configuration of the 23WT25 modem ................................................................................... 6
2.3.1 Configuration of baud rate......................................................................................7
2.3.2 Configuration of frequency .................................................................................... 8
2.3.3 Configuration of the serial interface ...................................................................10
2.3.4 Configuration of 2-wire and 4-wire setups ........................................................ 11
2.4 Configuration of the 500FSD20 modem..............................................................................13
2.5 Configuration of the NSK5 modem .......................................................................................14
2.5.1 Configuration of baud rate....................................................................................15
2.5.2 Configuration of frequency ...................................................................................16
3Verifying operation .................................................................................................................. 17
4Ordering Information ...............................................................................................................18
5References .................................................................................................................................19

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1Introduction
This document describes the connection of a rack-type NSK5 modem to a RTU560 rack-type
23WT25 or EDS500 DIN-rail 500FSD20 serial analog modem. Although the configuration is
different 23WT25 and 500FSD20 support the same baud rates and frequencies (channels).
The common compatible transmission modes of the 23WT25 in relation to the NSK5 modem
as well as the configuration that is required for these modes is described.
Description of the 500FSD20 configuration is available on request.
1.1 Motivation
Operators of networks in the energy grid rely on serial transmission of data over powerlines
to supervise and monitor telecontrol equipment. The interconnection of different communi-
cation devices is a key element in maintaining operation of business and investment.
1.2 Modulation
23WT25 and 500FSD20 as well as NSK5 work on the principle of frequency shift keying (FSK),
a modulation scheme highly immune to interference and noise.
The principle of FSK is the assignment of a characteristic frequency to a data bit to be trans-
mitted. A logic one (MARK) is assigned to frequency fLwhile a logic zero (SPACE) is assigned
to a higher frequency fU. The frequency fC = (fU + fL)/2 in the middle of the two characteristic
frequencies is called the center frequency. The deviation fd = (fU - fL)/2 is the difference be-
tween a characteristic frequency and the center frequency. The International Telecommunica-
tion Union (ITU) has published several standards based on FSK by its Telecommunication
Standardization Sector (ITU-T).
These standards comprise R.35 for 50 baud communication, R.37 for 100 baud, R.38A and
R.38B for 200 baud and V.23 for 1200 baud. 23WT25 and NSK5 deliver more possibilities than
these mentioned. Refer to section 2.2 for more details.

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2Configuration
2.1 Setup
Chapter 2 describes the connection of an NSK5 to a 23WT25 modem. It furthermore lists the
compatible transmission modes.
Figure 1: Communication setup for 23WT25 and NSK5
Both modems can be used in 2-wire as well as 4-wire connection. See Figure 1 for the wiring
scheme. in a point-to-point setup. The NSK5 modem has an optional additional backup line
(denoted by identifier "2") in case the main connection is broken. This switchover circuit is
not available on a 23WT25.
A modem at the end of a transmission line has to be terminated correctly. Please see 2.3 for
details for the 23WT25 modem and 2.5 for the NSK5 modem. If a modem is staggered some-
where in the run of a transmission line, it has to be configured to be high-impedant.
Integrated data regeneration is not featured. on the 23WT25. There is also no local test loop
according to ITU-T V.54 available for the 23WT25 modem.

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2.2 Supported channels and frequencies
23WT25 and NSK5 support mainly the same center frequencies and deviations. The NSK5 also
supports center frequencies above the ITU-T telecontrol and data band which reaches up to
3240 Hz. Only 600 baud and 2400 baud are not compatible to each other. A compatible 1200
baud plus speech option is not available on the 23WT25.
Baud rate
50
100
200
200/
300
1200
Deviation
NSK5
± 30 Hz
± 60 Hz
± 90 Hz
± 120 Hz
± 400 Hz
23WT25
± 30 Hz
± 60 Hz
± 90 Hz1
± 120 Hz
± 400 Hz
Center frequencies [Hz]
23WT25 + NSK5
420
480
540
600
540
1700
660
720
780
900
900
960
1080
1020
1140
1200
1260
1260
1380
1440
1560
1500
1620
1620
1680
1740
1860
1920
1980
2040
1980
2100
2160
2220
2340
2340
2400
2520
2460
2580
2640
2700
2700
2820
2880
3000
2940
3060
3060
3120
3180
NSK5
3300
3360
3420
3480
3420
3540
3600
3660
3780
3780
3840
3900
Table 1: Supported center frequencies and deviations per baud rate for 23WT25 and NSK5
1
Included in narrowband firmware release

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2.3 Configuration of the 23WT25 modem
The 23WT25 modem is configured by jumpers. For an in-depth description of all settings
please see the connections and settings document 1KGT 150 592. In this document only basic
settings for the interoperation of 23WT25 and NSK5 are described. The position of jumpers
can be taken from Figure 2.
Figure 2: Jumper layout 23WT25

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2.3.1 Configuration of baud rate
Transmission on the 23WT25 is fully bit-transparent, i.e. the duration of one bit on the serial
interface directly corresponds to the time during which the respective frequency is present
on the transmission line.
Therefore, data transmission is possible for any baud rate smaller or equal than the config-
ured baud rate. Configuration of the transmit baud rate is done via jumpers X2-6 to X2-8
while the receiving baud rate is configured by jumpers X3-6 to X3-8.
Please take jumper settings for baud rate configuration in transmit and receive direction
from Table 2.
Jumper
X2-6 to X2-8 / X3-6 to X3-8
Baud rate
Standard
8
7
6
1
·
·
·
2
·
·
·
3
·
·
·
50 Bd.
R.35
8
7
6
1
·
·
·
2
·
·
·
3
·
·
·
100 Bd.
R.37
8
7
6
1
·
·
·
2
·
·
·
3
·
·
·
200 Bd.
R.38A
R.38B
8
7
6
1
·
·
·
2
·
·
·
3
·
·
·
300 Bd.
R.38A
8
7
6
1
·
·
·
2
·
·
·
3
·
·
·
1200 Bd.
V.23
Table 2: 23WT25 Configuration of baud rate

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2.3.2 Configuration of frequency
The center frequency of the transmitter is configured by jumpers X2-1 to X2-5 while the re-
ceiver is configured by X3-1 to X3-5. Table 3 shows the corresponding jumper settings for the
possible center frequencies.
Jumper
X2-1 to X2-5 /
X3-1 to X3-5
R.35
50 Bd.
R.37
100 Bd.
R.38A/R38B2
200/3003 Bd.
V.23
1200 Bd.
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
420 Hz ± 30 Hz
480 Hz ± 60 Hz
600 Hz ± 120 Hz
540 Hz ± 90 Hz2
1700 Hz ± 400 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
540 Hz ± 30 Hz
720 Hz ± 60 Hz
1080 Hz ± 120 Hz
900 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
660 Hz ± 30 Hz
960 Hz ± 60 Hz
1560 Hz ± 120 Hz
1260 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
780 Hz ± 30 Hz
1200 Hz ± 60 Hz
2040 Hz ± 120 Hz
1620 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
900 Hz ± 30 Hz
1440 Hz ± 60 Hz
2520 Hz ± 120 Hz
1980 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1020 Hz ± 30 Hz
1680 Hz ± 60 Hz
3000 Hz ± 120 Hz
2340 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1140 Hz ± 30 Hz
1920 Hz ± 60 Hz
2700 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1260 Hz ± 30 Hz
2160 Hz ± 60 Hz
3060 Hz ± 90 Hz2
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1380 Hz ± 30 Hz
2400 Hz ± 60 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1500 Hz ± 30 Hz
2640 Hz ± 60 Hz
2
Included in narrowband firmware release
3
300 Bd. not available with narrowband firmware release

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5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1620 Hz ± 30 Hz
2880 Hz ± 60 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1740 Hz ± 30 Hz
3120 Hz ± 60 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1860 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
1980 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2100 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2220 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2340 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2460 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2580 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2700 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2820 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
2940 Hz ± 30 Hz
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
3060 Hz ± 30 Hz

2019-12-19 10/20
5
4
3
2
1
1
·
·
·
·
·
2
·
·
·
·
·
3
·
·
·
·
·
3180 Hz ± 30 Hz
Table 3: 23WT25 configuration of center frequencies
2.3.3 Configuration of the serial interface
The jumpers for serial interface configuration have to be placed into the default position. See
Table 4 for details.
Jumper
X7-1 to X7-7
Signal
Definition
X7-1
3
2
1
·
·
·
CTS
CCITT standard
X7-2
3
2
1
·
·
·
DCD
CCITT standard
X7-3
3
2
1
·
·
·
RxD
CCITT standard
X7-4
3
2
1
·
·
·
not used
X7-5
3
2
1
·
·
·
k1
DCD alarm delayed,
SQL alarm (X5-7=1-2)
X7-6
3
2
1
·
·
·
RTS
CCITT standard
X7-7
3
2
1
·
·
·
TxD
CCITT standard
Table 4: 23WT25 configuration of serial interface (default position)

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2.3.4 Configuration of 2-wire and 4-wire setups
The modem 23WT25 can be operated in 2- and 4-wire mode in a point-to-point or multidrop
topology. The jumper configuration for the different modes and topologies can be taken
from Figure 3, Figure 4, Figure 5 and Figure 6.
Figure 3: 23WT25 Two-wire mode, point-to-point
Figure 4: 23WT25 Two-wire mode, multidrop
Figure 5: 23WT25 4-wire mode, point-to-point

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Figure 6: 23WT25 4-wire mode, Multidrop

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2.4 Configuration of the 500FSD20 modem
The 500FSD20 DIN-rail device is a fully software configurable analog modem. Information on
configuration for NSK5 is available on request.

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2.5 Configuration of the NSK5 modem
The NSK5 modem is available in the variants G4AE, G4AF (refer to Figure 7) and G4AK (refer to
Figure 8). For an in-depth description of all settings please see the Instruction Manual docu-
ment 1KHL 015 989. In this document only basic settings for the interoperation of 23WT25
and NSK5 are described. The position of jumpers and connectors can be taken from Figure 7
and Figure 8. Jumpers in Figure 7 denoted by # are only available at NSK5 G4AF.
Figure 7: Jumper layout NSK5 G4AE and G4AF

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Figure 8: Jumper layout NSK5 G4AK
2.5.1 Configuration of baud rate
The baud rate of the NSK5 can be selected by switch positions 1 to 3 at the switches S1
(Transmit channel) and S2 (Receive channel) as listed in Table 2. For simplicity, only baud
rates compatible to 23WT25 and 500FSD20 are listed.
Switch S1/S2
Baud rate
Standard
1
2
3
On
On
Off
50 Bd.
R.35
Off
Off
On
100 Bd.
R.37
Off
On
Off
200 Bd.
R.38B
Off
On
On
200 Bd.
R.38A
On
Off
Off
300 Bd.
R.38A
On
On
Off
1200 Bd.
V.23
Table 5: NSK5 configuration of baud rates

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2.5.2 Configuration of frequency
The frequency of the NSK5 can be selected by position 4 to 8 of the switches S1 (Transmit
channel) and S2 (Receive channel) as listed in Table 6 and Table 7. For simplicity, only frequen-
cies compatible to 23WT25 and 500FSD20 are listed.
Switch S1/S2
R.35
50 Bd.
R.37
100 Bd.
R38B
200 Bd.
R38A
200/300 Bd.
4
5
6
7
8
Off
Off
Off
Off
On
420 Hz ± 30 Hz
480 Hz ± 60 Hz
540 Hz ± 90 Hz
600 Hz ± 120 Hz
Off
Off
Off
On
Off
540 Hz ± 30 Hz
Off
Off
Off
On
On
660 Hz ± 30 Hz
720 Hz ± 60 Hz
Off
Off
On
Off
Off
780 Hz ± 30 Hz
900 Hz ± 90 Hz
Off
Off
On
Off
On
900 Hz ± 30 Hz
960 Hz ± 60 Hz
1080 Hz ± 120 Hz
Off
Off
On
On
Off
1020 Hz ± 30 Hz
Off
Off
On
On
On
1140 Hz ± 30 Hz
1200 Hz ± 60 Hz
1260 Hz ± 90 Hz
Off
On
Off
Off
Off
1260 Hz ± 30 Hz
Off
On
Off
Off
On
1380 Hz ± 30 Hz
1440 Hz ± 60 Hz
1560 Hz ± 120 Hz
Off
On
Off
On
Off
1500 Hz ± 30 Hz
1620 Hz ± 90 Hz
Off
On
Off
On
On
1620 Hz ± 30 Hz
1680 Hz ± 60 Hz
Off
On
On
Off
Off
1740 Hz ± 30 Hz
Off
On
On
Off
On
1860 Hz ± 30 Hz
1920 Hz ± 60 Hz
1980 Hz ± 90 Hz
2040 Hz ± 120 Hz
Off
On
On
On
Off
1980 Hz ± 30 Hz
Off
On
On
On
On
2100 Hz ± 30 Hz
2160 Hz ± 60 Hz
On
Off
Off
Off
Off
2220 Hz ± 30 Hz
2340 Hz ± 90 Hz
On
Off
Off
Off
On
2340 Hz ± 30 Hz
2400 Hz ± 60 Hz
2520 Hz ± 120 Hz
On
Off
Off
On
Off
2460 Hz ± 30 Hz
On
Off
Off
On
On
2580 Hz ± 30 Hz
2640 Hz ± 60 Hz
2700 Hz ± 90 Hz
On
Off
On
Off
Off
2700 Hz ± 30 Hz
On
Off
On
Off
On
2820 Hz ± 30 Hz
2880 Hz ± 60 Hz
3000 Hz ± 120 Hz
On
Off
On
On
Off
2940 Hz ± 30 Hz
3060 Hz ± 90 Hz
On
Off
On
On
On
3060 Hz ± 30 Hz
3120 Hz ± 60 Hz
On
On
Off
Off
Off
3180 Hz ± 30 Hz
Table 6: NSK5 Configuration of frequency
Switch S1/S2
V.23
1200 Bd.
4
5
6
7
8
On
X
X
X
Off
1700 Hz ± 400 Hz
Table 7: NSK5 Configuration of frequency for V.23

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3Verifying operation
Operation can be verified by observing the LEDs. On the 23WT25 RTS and CTS light up when
data is going to be sent via the connected data terminal equipment (DTE). The TxD led should
only be flickering while RTS and CTS leds are on. On the NSK5 modem the DCD led should be
on during this time, and the RxD led should be flickering according to the TxD led of the
23WT25. As soon as the DTE attached to the NSK5 starts answering the DTE attached to the
23WT25, the RTS led of the NSK5 will be switched on, and the TxD led will be flickering during
this time. In return, the DCD led on the 23WT25 modem will be switched on now, and the RxD
led of the 23WT25 will flicker according to the TxD led of the NSK5. On the 23WT25 the SQ led
should stay off during the complete reception period as long as pauses between transmis-
sions are short enough not to trigger the delayed DCD alarm.

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4Ordering Information
For order numbers regarding the analog modems the table below can be used. NSK5 is end of
sale.
Product
Ident no
Description
23WT25
R0001
1KGT012400R0001
RTU560 plug-in modem 23WT25
500FSD20
R0001
1KGT039200R0001
500FSD20 analog DIN-rail modem
NSK5 G4AE
R0005
HENF209637R0005
NSK5 FSK modem
NSK5 G4AF
R0005
HENF209638R0005
NSK5 FSK modem with alternate route
selector
NSK5 G4AK
R0001
1KHL016009R0001
NSK5 FSK modem

2019-12-19 19/20
5References
Product
Reference(s)
23WT25
Datasheet
Connections and settings
1KGT 150 591
1KGT 150 592
500FSD20
Datasheet
1KGT 150 986
NSK5
Instruction Manual
1KHL 015 989
Contact
Technical questions: de-eds[email protected]
Comercial topics, orders: substationaut[email protected]
Further information: https://solutions.abb/eds500

—
ABB Power Grids Germany AG
P.O. Box 10 01 64
D-68128 Mannheim
Germany
solutions.abb/eds500
—
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to the contents of this document without prior notice.
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