Gotting HG 71912-A User manual

Device Description HG 71912-A




















Positioning And Ident
Interpreter For Offset Antennas
— One-dimensional / Indoor —
HG 71912-A
English, Revision 02 Dev. by: W.M.
Date: 12.07.2011 Author(s): RAD / L.S. / W.M.
Götting KG, Celler Str. 5, D-31275 Lehrte - Röddensen (Germany), Tel.: [phone] / 80 96 -0,
Fax: [phone] / 80 96 -80, eMail: [email protected], Internet: www.goetting.de

Content HG 71912-A
English, Revision 02, Date: 12.07.2011 2
Content
1 Introduction.......................................................................4
1.1 System Components............................................................... 4
1.2 Function ................................................................................. 4
1.2.1 Surveillance Of The Output Stage ..................................................5
1.2.2 Switchable reference transponder in the antenna ...........................5
1.2.3 Software Update (RS232) .............................................................. 5
2 Mounting...........................................................................6
2.1 Transponder ........................................................................... 6
2.2 Interpreter .............................................................................. 7
2.2.1 HG 71912ZA ................................................................................. 7
2.2.2 HG 71912YA ................................................................................ 8
2.2.3 HG 71912XA ................................................................................. 9
3 Commissioning................................................................10
4 Components and Operation .............................................14
4.1 Underground components ..................................................... 14
4.2 Antenna................................................................................ 15
4.3 Interpreter HG 71912-A......................................................... 15
4.3.1 Pin Allocations / LED ................................................................... 16
4.3.1.1 8 pin jack Interpreter <—> Processor........................................ 16
4.3.1.2 Allocation of the 26 pin round ribbon cable / of the SUB-D connec-
tor of the variant HG71912Y.....................................................16
4.3.1.3 Control LED............................................................................ 17
4.3.2 Interfaces .................................................................................... 18
4.3.2.1 RS 232 ................................................................................... 18
4.3.2.1.1 List of System Data that may be Output .................... 18
4.3.2.1.2 List Of System Commands ....................................... 20
4.3.2.1.3 System Monitor ........................................................ 21
4.3.2.2 Positioning Pulse (all Variants)................................................ 21
4.3.2.3 CAN OPEN (Version HG 71912ZA/XA) .................................... 22
4.3.2.4 Parallel Port (Version HG 71912YA) ........................................ 32
5 Software .........................................................................33
5.1 Terminal Program ................................................................. 33
5.1.1 How to find/add HyperTerminal .................................................... 33
5.1.2 Parameter Presetting................................................................... 34
5.2 System Monitor..................................................................... 35
5.2.1 How to start the monitor program ................................................. 35
5.2.1.1 Procedure Monitor Only .......................................................... 35
5.2.1.2 Procedure 3964/transparent .................................................... 35
5.2.2 How to work with the monitor program ......................................... 36

Content HG 71912-A
English, Revision 02, Date: 12.07.2011 3
5.2.2.1 Main Menu.............................................................................. 37
5.2.2.2 (W)rite Transponder................................................................ 39
5.2.2.3 (S)erial Interface ..................................................................... 39
5.2.2.4 P(a)rallel Interface .................................................................. 41
5.2.2.5 (C)AN-...................................................................Parameters42
5.2.2.6 CAN Terminator...................................................................... 43
5.2.2.7 P(o)sitioning Pulse.................................................................. 44
5.2.2.8 D(e)coding.............................................................................. 45
5.2.2.9 CS(V) Output .......................................................................... 45
5.2.2.10 (P)assword ............................................................................. 46
5.2.2.11 Se(t)up Ref.transponder Values .............................................. 46
5.2.2.12 (U)pdate Firmware .................................................................. 46
5.3 Software Update ................................................................... 47
5.4 Software Update (Antenna Software) .................................... 47
5.4.1 Configurationg The Update Program ............................................ 47
5.4.2 Proceeding A Software Update .................................................... 47
6 Trouble Shooting.............................................................50
7 Technical Data ................................................................51
8 Appendix.........................................................................53
A Physical Basics ................................................................................ 53
A.1 Field Arrangement of the Energy Field.....................................................53
A.2 Field Arrangement of the Transponder’s Reverse Signal ........................53
A.3 Induced Voltages in Sum and Difference Antenna...................................54
B Procedure 3964R ............................................................................. 54
B.1 Data direction antenna -> PLC.................................................................54
B.2 Data direction PLC -> Antenna ................................................................55
C Procedure "transparent"................................................................... 56
C.1 Data direction antenna -> PLC.................................................................56
C.2 Data direction PLC -> antenna.................................................................56
D Parallel Output ................................................................................. 56
E Positioning Pulse.............................................................................. 56
F Timing-Diagramm of the parallel interface ....................................... 57
9 List Of Pictures ...............................................................58
10 List Of Tables..................................................................59
11 Handbook Conventions....................................................61
12 Copyright and Terms of Liability ......................................62
12.1 Copyright.............................................................................. 62
12.2 Exclusion of Liability ............................................................. 62
12.3 Trade Marks and Company Names........................................ 62

Introduction HG 71912-A
English, Revision 02, Date: 12.07.2011 4
1 Introduction
The herein described system is especially suited for indoor areas. The electronic units
are not sealed within the antenna cases, but varnished. Therefore it is possible to ef-
fect all important settings and adjustable values after manufacturing. This leads to fair
priced systems. Software updates can be effected using a serial interface.
The interpreter G_71912-A supplies the transponder code as a serial signal or parallel
signal as well as a midpoint crossover pulse when crossing over a transponder, which
is reproducible very exactly.
The transponders used in this system are trovan™ transponder ID200 (read only) and
ID250 (read / write). These transponders are fair priced and especially suited for the
applications of this system (track guided or rail-mounted vehicles with fairly small
reading distances). This manual refers to equipment with software version 1.08.
1.1 System Components
The following components which all match the evaluation unit (see no. 3) are offered:
Figure 1 System components
1. Transmitting/receiving antenna HG 98787ZA (different antennas can be used in
this system)
2. Transponder HW DEV 00033 or Götting HG 71325ZA (on the track)
3. Interpreter HG 71912-A with positioning impulse output and two types of inter-
faces: serial / CAN (HG 71912ZA) or parallel (HG 71912YA)
4. Optional programming device for trovanTM transponder HG 818309A (not
shown in picture)
1.2 Function
As the antenna passes over the transponder, it energizes the latter with an energy field
of 128 kHz. The transponder returns its code at half of this frequency.
The transponder position in relation to the antenna surface is measured by a coil with
orientation in direction of travel. The interpreter decodes the transponder code. Each
crossing of the coordinate axis in driving direction generates a positioning pulse with
an adjustable duration.





Introduction HG 71912-A
English, Revision 02, Date: 12.07.2011 5
The serial output signal is a non-voltaic RS 232. Alternatively it is possible to use a
CAN bus. The positioning pulse is not galvanically separated but available as a +24 V
(20 mA) operational voltage switched output. Optional a 15 bit parallel output for the
code (24 Volt switched, non current limiting) can be effected.
Transponders may also be programmed. Therefore the transponder has to be located
within the antenna field at least 30 ms after starting the programming cycle.
1.2.1 Surveillance Of The Output Stage
The output stage is surveilled concerning the following errors:
-capacity of oscillatory circuit, short circuit, idling, detuning
-oscillator breakdown 128 kHz, frequency deviation
-short-circuit transmitting conductor, idling
-power transistor is defect
By this surveillance a certain probability of the function can be detected. Defective
contacts or ripped-off cables between interpreter and antenna are checked constant-
ly. A non-authorized change in parameters leads to the setting of a bit in the system
status (see also table 7 on page 19).
ATTENTION! Also the crossing of a massive steel plate may possibly trigger
the surveillance!
After programming the transponder an error bit is set, as the surveillance circuit reacts
to the altitude modulation (AM) of the output stage, which is created for programming
the transponder. The error bit is deleted by a successful reference transponder test.
1.2.2 Switchable reference transponder in the antenna
It is recommended that in front of each starting and each change of driving direction
a reference transponder test is proceeded via a serial command. That way, the com-
plete function of the antenna and of the interpreter is checked cyclically. If the test has
been successful, a positioning pulse is put out.
1.2.3 Software Update (RS232)
Until up to 10 seconds after turning on the device, an update can be started by using
a special PC program without opening the system monitor. Additionally, there is a sub-
menu for the software update in the system monitor (see also chapter 5.3 on page 47).
In order to not disturb the PC update program by the permanent telegram output, the
output starts only 10 seconds after turning on the device.

Mounting HG 71912-A
English, Revision 02, Date: 12.07.2011 6
2Mounting
2.1 Transponder
The maximum reading distance for all transponders can only be achieved when the
minimum distance to metal surfaces is maintained. There are some transponder types
especially optimized for the mounting directly on metal. To clarify the configuration, it
is essential to carry out tests!
As mentioned above, it is recommendable to maintain the minimum distances within
the metal-free area (Figure 2). The impact on positioning accuracy and range also de-
pends on the size and distance of metal parts.
Figure 2 Minimum spacings around the transponders (on-track mounting) and the
antenna G98767ZA
Alternatively the transponder can be mounted level with the road. In this case, the an-
tenna has to be placed into an accordingly lower position to ensure the nominal read-
ing distance.
NOTE! Electric power lines (for example for charging points) may not be
passed in this area, as the reading of the code will be compli-
cated or the code will be falsified by pulses which may occur.
Antenna
metal-free area
reading distance
isolation and distance plate (optional)
vehicle
track

Mounting HG 71912-A
English, Revision 02, Date: 12.07.2011 7
2.2 Interpreter
The interpreter is available in three different variants:
2.2.1 HG 71912ZA
Figure 3 Dimensions: interpreter HG 71912ZA
Variant ZA YA XA
Output serial
CANopen®parallel serial
serial
CANopen®
Mounting Aluminium flange Aluminium flange Plastic plate
Table 1 Variants: interpreter G 71912

Mounting HG 71912-A
English, Revision 02, Date: 12.07.2011 8
2.2.2 HG 71912YA
Figure 4 Dimensions: interpreter HG 71912YA

Mounting HG 71912-A
English, Revision 02, Date: 12.07.2011 9
2.2.3 HG 71912XA
Figure 5 Dimensions: interpreter HG 71912XA
180 mm
85 mm
44 mm
GÖTTING KG
Celler Str. 5, 31275 Lehrte
PWR
CD
POS ERR
DATA
TAG R/W-Unit
HG 71912-A
196 mm
65 mm
220 mm
105 mm
10 mm
7,5 mm
Ø 5,5 mm
Ø 12 mm
Isolationsplatte
54 mm

Commissioning HG 71912-A
English, Revision 02, Date: 12.07.2011 10
3 Commissioning
NOTE! Check the operating voltage before connecting! Although the
RS 232 interface reacts largely insensitive to interferences, the
cable should not be located directly beside power supply
cables.
Connect all necessary cables. For the next commissioning steps connect a laptop with
the antenna. Then start the monitor program as described in section 5.2 on page 35.
1. Move the transponder below the antenna
In the status line the voltage S has to rise significantly. The code has to be
detected immediately and the number of readings has to be counted up to 255
constantly. When the transponder crosses the center axis of the antenna in driv-
ing direction, a positioning pulse has to be generated.
2. Remove the transponder from below the antenna
If there is no transponder in the field, the voltage S has to fall to extremely small
values. The code display and an possible display of the number of readings
remain. If that is not the case, interferences in a frequency range of 64 kHz are
induced.If no errors occurred, the monitor program can be closed. Remember
to save possibly altered values. After changing certain parameters, a system
reset is required (turning off and on the antenna). This procedure is explained in
the corresponding chapter of the monitor program (see chapter 5.2 "System
Monitor" on page 35).
3. Now proceed an one-time reference transponder setup by transmitting the cor-
responding serial command (see table 4.3.2.1.2 on page 20) or by using the
corresponding submenu in the monitor program (see table 5.2.1 on page 35).
NOTE! This command may only be carried out once during the commis-
sioning, as otherwise changes in the accuracy of the antenna
remain undiscovered, as they are included in the reference val-
ues each time a setup of the reference transponders is pro-
ceeded!
The new reference values, found during the reference transponder setup (sum. and
difference voltage), are saved automatically to the parameter E2PROM when applying
the serial command.
4. Now, it is recommended to protocol a complete drive. Depending on the
antenna version there are different possibilities:
Parallel interface (in the interpreter version HG 71912YA)
Here, a logging is possible via a serial interface (see chapter 5.2.2.9 on page 45).
CAN-Bus (in the interpreter version HG71912ZA, XA)
Here, a logging is possible via a serial interface (see chapter 5.2.2.9 on page 45).

Commissioning HG 71912-A
English, Revision 02, Date: 12.07.2011 11
In the following diagrams examples for registered data are shown:
Figure 6 Diagram: commissioning protocol / low interference; sum voltage over track
In the diagram the sum voltage over the track is shown. The noise (interference) level
is located at 50 samples, the signal at 950. The decoding of the transponder is fault-
less, as also shown in the following picture.
Figure 7 Diagram: commissioning protocol / undisturbed decoding of the transpon-
der
Low interference level
Undisturbed decoding of the transponder

Commissioning HG 71912-A
English, Revision 02, Date: 12.07.2011 12
When crossing a transponder the sum voltage rises. After exceeding the Threshold
for Decoding the bit TRANS_IN_FIELD is set. After 4 x 8 ms ( = four data points)
is transponder code is decoded. The duration depends on the settings made under
Number of Equal Codes in the submenu Time & Code. In this example 2is cho-
sen, that means that the input code is compared with the two precedent codes.
After crossing the center of the antenna the POSI pulse is triggered. Its duration is
terminable. The bits TRANS_IN_FIELD and CODE_OK are deleted, as soon as the sum
voltage falls below the Threshold for Decoding. In this example a reserve from
6x 8 ms for triggering the POSI-Puls is left. The crossing velocity is approx. 0.87 m/
s (140 mm length of antenna / 20 x 8 ms).
In the following protocols the impacts of a high interference level can be seen.
Figure 8 Diagram: commissioning protocol / high interference; sum voltage over
track
The interference level reaches up to 300 samples. At transponder 207 the noise is due
to a charging station so high, that it even influences the transponder signal. As an im-
pact it takes 9 x 8 ms until the transponder 203 is decoded (see Figure 9 on page 13).
This is sufficient for a slow crossing velocity of 0.5 m/s (140 mm / 33 x 8 ms) to gener-
ate a POSI pulse, in contrast a velocity of 1 m/s is to high, this transponder cannot
be crossed with such a velocity.
High interferece level

Commissioning HG 71912-A
English, Revision 02, Date: 12.07.2011 13
Figure 9 Diagram: commissioning protocol / disturbed decoding (but still functional)
In the following diagram it is shown how a false set Threshold for Decoding or
Threshold for Positioning can cause erroneous POSI pulses.
Figure 10 Diagram: commissioning protocol /POSI-Pulse triggered by noise & too high
Threshold
In this example the thresholds are set to 100 samples. The bit TRANS_IN_FIELD is set
constantly. After a successful decoding a correct POSI pulse is triggered. As the
software does not know, that the antenna field is left then, each further zero crossing
of the difference sum generates a new POSI pulse.
Disturbed decoding (function still available)
POSI-Pulse triggered by noise & too high threshold

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 14
4 Components and Operation
4.1 Underground components
Transponders of the type HG DEV 00033 will be used as reference points. All descri-
bed RW transponders can be programmed using the mentionned reading antennas
or a programming device (G 81830YA).
Range and accuracy of the system are influenced by:
-any large metal pieces (sheets) on the ground
-proximity of any floor reinforcement (see chapter 2 "Mounting" on page 6, section
2.1 "Transponder" on page 6)
-Inductive loops, as they are created e.g. by steel building mats have a great influ-
ence. Individual metal poles have little effect. Those may be partly within the
metal-free area (see Figure 2 on page 6).
-Cable with pulsed currents with spectral parts between 64 kHz ±4 kHz
The following environmental conditions have no effect on the system:
-Snow, ice, water
-Oil, tar, earth, dirt, etc.
Code structure
The code length of the read only transponders ID200/800 is 38 bit. The configurable
read/write transponders ID250/850 have to be configured in such a way that only the
data block 2 with its 20 bit of useful data is output. The system decodes and outputs
the entire code string; when using the parallel interface only the 15 lowest bits are out-
put. The data protection within the trovan™ transponders is done by line (of 3 bit each)
and column parity. To achieve a better data protection, it is therefore recommended to
implement an additional code check when using RW transponders. The transmission
duration for one complete telegram is 8 ms for both types.

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 15
4.2 Antenna
In general, different antennas which are all described within their own device descrip-
tions can be used with this interpreter (the right device description has been delivered
with the system), but at the moment, there is only one matching type:
-HG 98767ZA - this antenna has an effective antenna surface of 130 x 180 mm and
allows a crossing velocity of 2 m/s (with positioning pulse)
4.3 Interpreter HG 71912-A
Figure 11Interpreter HG 71912-A (shown: version HG 71912ZA with serial interface)
The electronics of the interpreter are cased in a aluminium housing (206 x 87 x 48 mm
incl. fastenings clips). The antenna can be connected via a 9 pin jack. The interpreter
can also be connected to the processor of the device via a 8 pin plug. The connections
can be found on the front end of the device. Concerning the interfaces and cables the
following variants are available:
Variant Description
HG71912ZA serial interface & CAN bus with 8 pin panel jack
HG71912YA Parallel and serial interface with cable and 25 pin Sub-D
plug
HG71912XA like variant ZA, but fastening via plastic plate
Table 2 Overview variants: Interpreter HG 71912-A

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 16
4.3.1 Pin Allocations / LED
4.3.1.1 8 pin jack Interpreter <—> Processor
4.3.1.2 Allocation of the 26 pin round ribbon cable / of the SUB-D connector of
the variant HG71912Y
NOTE! The metal parts of the Sub-D connecter are connected to the
shielding of the cable and the casing and should be positioned.
The contacts are allocated as follows:
No. Colour Description
1white +24 V
2brown GND
3green CAN H
4yellow CAN L
5grey POSI
6pink TxD (RS232)
7blue RxD (RS232)
8 — shielding
Table 3 Allocation 8 pin jack Interpreter <—> Processor
Lead # Contact #
(SUB-D)
Allocation
(SUB-D)
1 1 Data Ready
214 D14
3 2 D13
415 D12
5 3 D11
616 D10
7 4 D9
817 D8
9 5 D7
10 18 D6
Table 4 Alloc. of the 26 pin round ribbon cable/of the SUB-D connector

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 17
4.3.1.3 Control LED
There are five control LED.
11 6 D5
12 19 D4
13 7 D3
14 20 D2
15 8 D1
16 21 D0
17 9TxD (RS232)
18 22 RxD (RS232)
19 10 POSI
20 23 not connected
21 11 +24V
22 24 +24V
23 12 GND
24 25 GND
25 13 Chassis
26 -Chassis
LED Colour Function
PWR yellow shows the current operating voltage
CD yellow lit, when the receiving voltage exceeds <Threshold for
Decoding>
DATA yellow Blinks, if transponder approaches (also at noise), is lit con-
stantly when the transponder is read reliable
Table 5 Control LED
Lead # Contact #
(SUB-D)
Allocation
(SUB-D)
Table 4 Alloc. of the 26 pin round ribbon cable/of the SUB-D connector

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 18
4.3.2 Interfaces
4.3.2.1 RS 232
The serial output may be configured in several ways. The transmission rate is adjust-
able between 9600 and 19200 Baud, the output protocol may be chosen as either
"transparent" or "3964 R" (see also sections B on page 54 and C on page 56). Apart
from that, the content of the telegrams is configurable, as the user may choose from a
list of parameters. Serial commands are used for activating a system monitor.
4.3.2.1.1 List of System Data that may be Output
A telegram of the serial RS 232 output consists of max. 13 bytes. The minimum update
rate at 9.6 KB is then calculated as follows:
Figure 12 Formula: Minimum update rate
As the transmission is binary, it is possible — when using the 3964R procedure — to add
further (DLE) characters by this procedure.
All multiple byte variables are output either with the highest byte or the lowest byte first
(adjustable)! The 8 bit check sum is only output when using the transparent protocol.
It then includes the start character. The start character, as well as the check sum
(transparent protocol) cannot be removed from the data block.
The protocol is adjustable, irrespective of whether telegrams are put out permanently
by an adjustable update rate or whether one transponder is located within the field.
POS green represents the positioning output
ERR red is lit when the error bits DEC_HW_ERR, PARAM_ERROR
or ANTENNA_ERR are set or when the reference tran-
sponder test was unsuccessful
(see also Table 7 on page 19)
additional CANopen®-Function:
- lit: permanent CAN bus error (bus offline)
- blinks slowly: CANopen®state preoperational
- blinks quick: CANopen®state stop
LED Colour Function
Table 5 Control LED
13 Byte
Telegramm
------------------------------11 Bit
Byte
------------9600Bit
s
-------
 14 9 ms
Telegramm
------------------------------
=.

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 19
Table listing the data words of a telegram of 12 (13) byte length:
The following table shows a list of the binary codes used to describe the system status
(for bytes # 11 and 12 from Ta b l e 6 ):
Byte # Length Valuehex Type Description
11 Byte 1unsigned char start sign ASCII-061: "="
2,3,4,5 4 Byte 2unsigned long 32 bit transponder code
6,7 2 Byte 4unsigned int voltage generated by transponder in frame
antenna in samples
8,9 2 Byte 8signed int voltage generated by transponder in difference
antenna in samples
10 1 Byte 10 unsigned char number of code readings of last transponder
crossing
11,12 2 Byte 20 unsigned int systems status in binary coding
(13) 1 Byte unsigned char check sum (only at transparent protocol)
Table 6 Data words of a telegr. w. 13 byte length (equals 12 data bytes)
Value Name Description
0001 DEC_HW_ERROR hardware of code decoder erroneous
0002 CODE_ERROR transponder code received with check sum error
0004 PARAM_ERROR checks sum of parameters in E²PROM not correct
0008 ANTENNA_ERR voltage/frequency at antenna inductor outside specification a.
0010 REF_TRANS_ON hint, that the reference transponder is active (test in process)
0020 REF_TEST_OK reference transponder test was successful b.
0040
0080 TOGGEL see description "CANopen®" in chapter 5.2.2.5 on page 42
0100 RW_TRANSPONDER transponder is writable
0200 TRANS_IN_FIELD transponder is being detected c.
0400 CODE_OK code decoded without errors c.
0800 SEG- transponder below connected half of antenna
1000 POSIPULS transponder crossed center of antenna c.
Table 7 Possible system notes / error messages (part 1 of 2)

Components and Operation HG 71912-A
English, Revision 02, Date: 12.07.2011 20
Example:
Error 0006 means CODE_ERROR and PARAM_ERROR.
NOTE! Error 0002 may also occur during ordinary transponder cross-
ings, if the code transmission is aborted due to decreasing
power output level.
4.3.2.1.2 List Of System Commands
A Command telegram always consists of four bytes, including the command itself, its
parameters and at last the check sum (XOR relation of all bytes with starting sign).
When choosing the procedure "transparent" (see also appendix, see page C on page
56) also a start sign has to be sent.
Four commands are defined:
2000
4000
8000 RESET PowerOn or Watchdog Reset proceeded d.
A.ISDELETED, AS SOON AS VOLTAGE AND FREQUENCY CORRESPOND TO THE SPECIFICATIONS.
B.THE VALUES FOR CODE, USAND UDEQUAL THE SAVED VALUES. THE BIT REMAINS SET UNTIL THE NEXT TEST AND IS DELETED
BY UNSUCCESSFUL REFERENCE TRANSPONDER TEST.
C.THESE BITS ARE DELETED AS SOON AS THE TRANSPONDER LEAVES THE ANTENNA FIELD.
D.ISDELETED AT THE FIRST CALL OF THE REFERENCE TRANSPONDER TEST.
No. Meaning Procedure Start
sign
Command
byte Parameter Check sum
1
Switch to monitor
mode (described in
5.2 "System Moni-
tor" on page 35)
3964R
HEX 4D16 4F164E164916
ASCII MONI
trans-
parent
HEX 3D16 4D16 4F164E164916 3816
ASCII = M ONI 8
2
Programming the
code ttttt
x= reserved for
future applications,
at the moment vari-
able
3964R HEX 5016 Code in der
Form xt16tt16tt16
Für den Code
"12345" z. B.
011623164516
trans-
parent
HEX 3D16 5016 0A16
Table 8 List of system commands
Value Name Description
Table 7 Possible system notes / error messages (part 2 of 2)