Kodak XP 3478 User manual

Network Installation Manual Publication No XP 3478
4/99
Supersedes 7/97
KODAK
Network ID Camera
Health Imaging

PLEASE NOTE
The information contained herein is based on the experience and
knowledge relating to the subject matter gained by Kodak prior to
publication.
No patent license is granted by this information.
Kodak reserves the right to change this information without notice, and
makes no warranty, expressed or implied, with respect to this information.
Kodak shall not be liable for any loss or damage, including consequential or
special damages, resulting from the use of this information, even if loss or
damage is caused by Kodak’s negligence or other fault.

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Table of Contents
Description Page
1 DATA DOWNLOAD 1
1.1 Patient data........................................................................................................................................1
1.1.1 General ........................................................................................................................................1
1.1.2 Direct mode..................................................................................................................................1
1.1.3 Download mode............................................................................................................................1
1.1.4 Physical connection...................................................................................................................... 1
1.2 X-ray data...........................................................................................................................................2
1.2.1 General ........................................................................................................................................2
1.2.2 Physical connection...................................................................................................................... 2
2 THE PROTOCOLS 3
2.1 Patient data........................................................................................................................................3
2.1.1 General ........................................................................................................................................3
2.1.2 KODAK Network ID Camera Download protocol...........................................................................3
2.1.3 Direct protocol..............................................................................................................................4
2.1.4 Field List.......................................................................................................................................5
2.1.5 Protocols compatible with the KODAK X-OMATIC Identification Camera, Model 2010..................6
2.1.6 Examples .....................................................................................................................................7
2.2 X-ray data...........................................................................................................................................9
2.2.1 General ........................................................................................................................................9
2.2.2 MMAT3000................................................................................................................................... 9
2.2.3 Senographe................................................................................................................................ 11
2.2.4 GXDP-P/-NP .............................................................................................................................. 13
3 PHYSICAL CONNECTION. 17
3.1 The HOST and AUX connector....................................................................................................... 17
3.2 The NET Connector......................................................................................................................... 17
3.3 Building a RS422 Network.............................................................................................................. 19
3.3.1 Installing Procedure.................................................................................................................... 20
3.3.2 Troubleshooting RS422 .............................................................................................................. 20
3.4 Built in diagnostic software............................................................................................................ 21
3.4.1 Serial analyzer............................................................................................................................ 21
3.4.2 System logger ............................................................................................................................ 22
APPENDIX A 25
ISO-8859-1 Character set...................................................................................................................... 25

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1Data Download
1.1 Patient data
1.1.1 General
The Kodak Network ID camera is able to receive patient data from a patient booking
system. This can be achieved in two ways depending on how the booking system works.
1.1.2 Direct mode.
This mode is used when each camera can be connected to its own terminal of the
booking system. When a patient arrives to the examination room and that is registered at
the terminal of the booking system the booking system immediately sends the patient
data to the camera which immediately displays it. This means that no user interaction is
necessary on the camera to make the camera ready for marking.
1.1.3 Download mode.
This mode is used when all cameras are connected to the central computer of the
booking system through one serial channel or if there are no terminals in each room. In
download mode a complete patient list is sent to each camera and operator has to bring
up this list on the camera to select the patient when the patient arrives at the examination
room. In this case all cameras are connected in parallel to one serial channel on the host
computer.
Except for patient data, time and date of the booking is also sent which the KODAK
Network ID Camera uses to sort the booking list. When the user brings up the booking list
the patient nearest in time is pointed out. This means that the user only needs a few
keystrokes to select the patient. To allow a camera to only store patients intended for a
specific room each patient data record is associated with a camera name and the camera
may reject all patients not intended for a specific room. Note that it is possible for more
then one camera to have the same name for example if there are many rooms that do the
same examination and the patients are taken to the room that gets available first.
Patients can be sent to the booking list at any time and any number of times. Duplicates
are thrown away and when the booking list becomes full the patient with the oldest
booking time is removed from the list.
1.1.4 Physical connection.
There are two ways to physically connect the camera to a booking system. Any of the
connections can be used with any of the protocols above. Just remember that if the direct
protocol is used cameras can not be connected in parallel as they would in that case
bring up the same patient at the same time and that is not very functional.

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One is through a RS232 interface. This is the normal way to use when using the direct
mode as one camera is connected to one host computer. Note that communication is
one-directional, from the host to the camera, which means that it is possible to connect
more then one camera to one host using RS232 but as the driving capacity of RS232 is
limited, which affects both maximum cable length and number of cameras, this is not
recommend.
The other is through a RS422 interface. This is the normal way to use when using the
download mode. It allows longer cables (up to hundreds of meters depending on which
sender is used) and it allows may cameras to be connected in parallel. It can of cause
also be used with the direct protocol for example if the cable distance is too long for
RS232.
1.2 X-ray data
1.2.1 General
The Kodak Network ID Camera is able to receive and exposure data, like kV and mAs,
from a X-ray unit. When the X-ray unit make a exposure, exposure data is sent to the
Kodak Network ID Camera and when the film later is marked by Kodak Network ID
Camera the exposure data is printed on the film together with patient data.
Kodak Network ID Camera can be connected as usual to a booking system for
downloading patient data. One camera is needed for each X-ray unit.
The sequence of operation is that when the patient arrives for the research patient data is
entered into the camera the usual way (manually or through booking system). After an
exposure is made the exposure data is immediately sent from the X-ray unit to KODAK
Network ID Camera. The cassette should immediately after the exposure be brought to
the camera and marked. The camera only stores data from the latest exposure. If
KODAK Network ID Camera would store data from many exposures to allow many
cassettes to be marked afterwards there is a big risk of exchanging cassettes so there
are many reason to force an immediate marking. To prevent a cassette to be marked
when there is no exposure data KODAK Network ID Camera can be configured to not
allow marking if exposure data is not available. When a marking is made the exposure
data is immediately erased to prevent two cassettes to be marked with the same data by
mistake.
1.2.2 Physical connection
Kodak Network ID Camera can receive X-ray data through a RS232 interface. Most X-ray
units are, or can be, equipped with a printer interface and through this Kodak Network ID
Camera can be connected instead of a printer.

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2The Protocols
2.1 Patient data
2.1.1 General
Four protocols are available. Two protocols were created for the Kodak Network ID
Camera with the intention of giving a flexible protocol which can handle language
dependent information and can transfer more data then just the name and patient ID.
Two other protocols were implemented to be compatible with the KODAK X-OMATIC
Identification Camera Model 2010 that was sold in the Nordic countries between 1990
and 1993. We do not recommend that new software are written for these protocols.
The protocols are in the camera called;
DIRECT The KODAK Network ID Camera direct mode
protocol
DOWNL The KODAK Network ID Camera download protocol
2010 B A protocol compatible with the KODAK X-OMATIC
Identification Camera Model 2010 used when the
camera is connected to a transmitter box called
MNT10.
2010 D A protocol compatible with the KODAK X-OMATIC
Identification Camera Model 2010 used when the
camera is connected without the MNT10.
All protocols accept national characters according to ISO8859-1 standard, please refer to
appendix A.
2.1.2 KODAK Network ID Camera Download protocol
The protocol:
#group;date;time;fieldlist#CR,LF
Group is the name of the lab where the camera(s) are located. This may be used to
select which camera(s) should store which patients. If this field is left blank
(the trailing ; must be included) the camera will accept the patient data
regardless of the name of the camera. This can be used as a broadcast to all
cameras.
Date is the booked date for the research. Date format is YYMMDD or DDMMYY
depending on which country the camera is configured for. The same format is
used as when displaying the date information in the main window of the
camera.

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Time is the booked time for the research. Time format is HHMM. The date and time
information is used to sort the list and to be able to point out ”best guess”
when opening the window with the list of patients.
Field list This is described below as it is the same format as for direct communication.
At least one name field must be included in the field list and for countries
using patient ID a patient ID field must also be included. See field list
specification below for more details
CR,LF These two characters terminates the block. To make the protocol as
compatible as possible the camera will accept, CR only, LF only and any
sequence of CR and LF.
Trailing and leading spaces in all fields in the field list are removed so if the programming
language used for the sender software has problems sending variable length text strings
(as some COBOL dialects do), just pad with spaces and the camera will remove them.
Just make sure that the total length including leading and trailing ‘#’ does not exceed 128
characters.
2.1.3 Direct protocol
This protocol is used when one camera is connected to one terminal. When the patient
data is sent from the computer the patient data window is immediately opened with the
data transferred.
#window;field list#CR,LF
Window is a single digit telling which cassette window should be used. Currently two
are defined. ‘1’ is the standard C1 window, ‘2’ is the narrow C1N window. If ‘*’
is used instead of a digit the window currently selected by the operator is
used.
Field list This is described below as it is the same format as for download
communication.
CR,LF These two characters terminates the block. To make the protocol as
compatible as possible the camera will accept, CR only, LF only and any
sequence of CR and LF.
The following string may be sent to the camera to close the window when the
examination has finished.
#QUIT#CR, LF
Trailing and leading spaces in the patient ID and name fields and fields in the field list are
removed so if your program has problems sending variable length text strings (as some
COBOL dialects do), just pad with spaces and the camera will remove them. Just make
sure that the total length including leading and trailing ‘#’ does not exceed 128
characters.

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2.1.4 Field List
The field list contains the information that will be displayed in the different fields of the
window.
The field is in the following format:
nr:text
nr is the two-digit field number, text is any text that fits into the field. If the field is too long
the camera will just truncat the text to make it fit. If more then one field should be
transferred more fields can be transferred by separating them with ‘;’.
There are also three special fields used by the download protocol:
I:PID
N:name
Nn:name
PID is the patient ID of the patient. It should be in the format defined in the country
where the camera is used. If the patient ID is invalid it will be displayed as a
spare patient ID (underlined) number when appearing on the display. The
patient ID field is mandatory for countries using patient ID when using the
download protocol.
Name is the name of the patient. This field is always mandatory when using the
download protocol.
In the Nn: field ’n’ represents a number from 1 to 9. This is used if more then one name
field is defined in the window. When the patient name is displayed in the booking list of
the camera all Nn fields are merged together with a comma in between. The N1 field will
be displayed in the first name field of the window, N2 in the second and so on.
The field number here is not the field number presented in the left column of the
exposure window set-up. Instead there is a translation table setting the correspondence
between the field number in the message and the field number of the exposure window.
This is because we want the user be able to change the configuration of the camera
without having to change the program in the host computer.
From the programmers point of view, he or she can select numbers sequentially from 0
and upwards for his information and the person who configures the camera then sets
where that data will be displayed. This way the programmer must not know how the
camera is configured. If there is no information for a field it can be completely omitted. It
is legal to send information for field 1 and 3 for one patient and 1 and 2 for some other
patient. Just watch out so that the total length of the protocol is not longer then 128
characters.
As a feature to make it easier to send data from programs through a printer driver which
is page oriented CR/LF is allowed before any semicolon. This way it is possible to send
data from a MS-WINDOWS® program by defining a printer of type generic and design a
report with fields put on different lines and then send the data to the camera by printing
such a report.

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2.1.5 Protocols compatible with the KODAK X-OMATIC Identification Camera,
Model 2010
Because of compatibility reasons the protocol of the KODAK X-OMATIC Identification
Camera Model 2010 is also included in the Kodak Network ID Camera. KODAK X-
OMATIC Identification Camera, Model 2010 was sold in the Nordic countries between
1990 and 1993. We strongly recommend that no new software is written for any of these
protocol.
Two versions of this protocol are available.
2010 B A protocol compatible with the KODAK X-OMATIC
Identification Camera Model 2010 used when the
camera is connected to a transmitter box called
MNT10.
This protocol includes the STX, ”2” and ETX
characters of the description below.
2010 D A protocol compatible with the KODAK X-OMATIC
Identification Camera Model 2010 used when the
camera is connected without MNT10.
This protocol excludes the STX, ”2” and ETX
characters of the description below
If a field contains more characters then needed, the field should be padded with spaces.
National characters like ÅÄÖ can be sent either as 7-bit ANSI code or as 8 bit ISO 8859-1
or the codepage 850 code which DOS uses. Please refer to appendix A.
2010 B 2010 D
0STX 0x02 Start of text
1‘2’ 0x32 Source, always ‘2’
2 .. 7 0 .. 5 Address
8 6 ‘ ‘ 0x20 Separator
9, 10 7, 8 DD Booked date, Day, (for Sweden year)
11, 12 9, 10 MM Booked date, Month
13,14 11, 12 YY Booked date, Year, (for Sweden day)
15 13 ‘ ‘ 0x20 Separator
16, 17 14, 15 HH Booked date, Hour
18, 19 16, 17 MM Booked date, Minute
20 18 ‘ ‘ 0x20 Separator
21 .. 60 19 .. 58 Name, 40 characters
61 59 ‘ ‘ 0x20 Separator
62 .. 72 60 .. 70 Patient ID (11 to 14 char, no check)
73 71 CR 0x0d Carriage return
74 72 LF 0x0a Linefeed
75 ETX 0x03 End of text

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2.1.6 Examples
Below follow some examples of all of the protocols.
2.1.6.1 Example download protocol
Let’s say that you like to send the patient ID ”950822-1234” the patient name ”Eric
Johnsson” and one line of text ”Broken leg” to the camera and any window should be
used. The following string should be sent to the camera.
#LAB1;960824;1200;I:950822-1234;N:Erik Johnsson;1:Broken leg#CR,LF
In next example a patient ID and data for two name fields are sent and also text for two
other fields.
#LAB1:960824;1215;I:950822-1234;N1:Eric;N2:Johnsson;1:150 ml
contrast;2:Cardio#CR,LF
2.1.6.2 Example direct protrcol
Let’s say that you like to send the patient ID ”950822-1234” the patient "Eric Johnsson”
and one line of free text ”Broken leg” to the camera and any window should be used. The
following string should be sent to the camera.
#*;01:950822-1234;02:Eric Johnsson;03:Broken leg#CR,LF
2.1.6.3 Example of protocol compatible with the KODAK X-OMATIC IDENTIFICATION
CAMERA, MODEL 2010
In the 2010 camera the field lengths, and hence the record length, are fixed and to show
this the period character is used to show the space character below:
STX
2
LAB1...960824.1215
Eric Johnsson............................
950822-1234
CR
LF
ETX

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2.2 X-ray data
2.2.1 General
Kodak Network ID Camera has three built in software selectable communication protocol
for receiving X-ray data.
MMAT3000 -Receiving data from Siemens Mammomat3000.
SENOGRAPH -Receiving data from GE Medical System Senographe.
GXDP -Is a General X-ray Data Protocol.
2.2.2 MMAT3000
Twelve different exposure data are sent from the Mammomat®and each and one of them
can be individually placed on the picture, more about that below. The following data’s are
available.
Data Value Length
Focus SF/LF* 2
Anode W/Mo* 2
Filter Rh/Mo* 2
kV 0 to 99kV 2
mAs 0 to 999 mAs 3
Exp.time 0 to 99999 ms 5
Magnification 0.00 to 9.99 4
Force 0 to 99 Kg 2
Thickness 0 to 999 mm 3
Grid No grid/Grid* 7
Density -9.9 to +9.9 4
Angle -180 to +180 degree 4
*The texts displayed here may be changed in KODAK Network ID Camera. The data is
sent as 0 or 1 from the Mammomat®and translated by KODAK Network ID Camera to
the appropriate texts.
2.2.2.1 Configuration of Kodak Network ID Camera
Configuration of KODAK Network ID Camera for connection with the Mammomat®can be
divided into two parts. One is to configure the serial channel for communication with the
Mammomat®, the other is to create the picture that will be printed on the film.
The Mammomat®is connected to the AUX connector at the back of the KODAK Network
ID Camera. The communication is set-up by entering set-up mode of the camera, please
refer to the Installation and Setup Manual. When in the communication set-up, press the
F1 key so that the word "Channel: AUX" is displayed in the upper rigth corner. The set-up
should now be set to:
Baudrate 9600
Parity NONE
Databits 8

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Protocol MMAT3000
As mentioned above when the different data available is shown the texts for a few items
can be changed (those marked with *). This is done by opening a new set-up window by
pressing Shift-F1 from this set-up window.
Creating the picture which will be printed on the film is done in the same way as usual
except that there is one extra field type available. The COMM field type. When such a
field is selected and enter is pressed an extra selection appears in the window called
COMM: were you select which kind of exposure data should be displayed in the field. To
build a picture you will have to define one COMM field for each exposure data to display.
Note that the field data do not include the unit (kV mAs and so on). To add that an F-text
field with the appropriate text has to be inserted after the COMM field.
2.2.2.2 The Mammomat®
DISCLAIMER: The information in this chapter is given to us by Siemens Elema in
Stockholm and neither Triacon or Kodak can guarantee the correctness of the
information.
The exposure data connection works with Mammomat®3000 equipped with software
version 1.6 or later. Also the hardware must be up to date. Serial numbers starting at
2486 and later are up to date. Siemens Elema estimates that equipment fulfilling these
requirements are delivered from spring 1996. Earlier versions of the Mammomat®3000
may be updated both regarding hardware and software.
In addition to the requirements above the Mammomat®must also be equipped with a
printer interface. The installation kit for the printer interface includes a printer cable and
below follows a description on how to make an adapter between this cable and KODAK
Network ID Camera. Since the printer cable is standard with the printer interface we
recommend using this cable and adding an adapter rather than making a completely new
cable.
If the correct Mammomat®software and hardware are installed the Mammomat®will
automatically configure it self for use with the KODAK Network ID Camera when the
KODAK Network ID Camera is connected.
2.2.2.3 The KODAK Network ID Camera.
If the Mammomat®is ready you will only need a standard equipped KODAK Network ID
Camera and a cable between the Mammomat®and KODAK Network ID Camera to get it
to work.
2.2.2.4 Post-installation test.
After installation the configuration should be carefully tested. For all parameters which
presents values from a list it should be tested that all values will be presented. Remember
that you are not only testing the configurartion of the camera but also that the
Mammomat®is sending the correct value. For all numeric values you should make sure
that the longest possible value is presented correctly (for example all five digits of the
exposure time) and that the least significant digit is presented. Avoid if possible to use
values like 2000. It is better to test with a value like 2318.

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2.2.2.5 Cable between KODAK Network ID Camera and Mammomat®3000
Parts
1DSUB 25 pin female connector
1A shielded housing to the above
1DSUB 9 pin male connector
1A shielded housing to the above
1Shielded 3 wire cable
Connect the two connectors according to the following table.
25 pin female 9 pin male
2 2
3 3
7 5
2.2.3 Senographe
Fifteen different exposure data are sent from the Senographe DMR and each and one of
them can be individually placed on the picture, more about that below. The following
data’s are available.
Data DMR Value Length
Mode AOP, AEC, Manual* 6**
Sub Mode STD, CTS, DOSE* 4**
Focal Spot SF, LF* 2**
Track RH, MO* 2**
Filter RH, AL, MO* 2**
kV From 22 to 49 2
mAs From 1 to 600 3
Tpose
(exposure) 0 to 20000ms 5
Focus 51,56,61,66 2
Magnificatio
nBy % ex 150 3
Force 0 to 20 daN 2
Thickness 0 to 999mm 3
Cell Normal, Center Stereotix, Left
Stereotix, Right Stereotix 6**
Screen/Film Label given by console max 7 but depends
on setup of Senix
Radiological
thichness 0 to 999 3
*The texts displayed here may be changed in KODAK Network ID Camera. The data is
sent as 0 or 1 from the Senographe and translated by KODAK Network ID Camera to
the appropriate texts and these texts can be changed from the default values.
** The length depends on the values set up. The data is sent as 0 or 1 from the
Senographe and translated by KODAK Network ID Camera to the appropriate texts
and these texts can be changed from the default values shown above.

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2.2.3.1 Configuration of KODAK Network ID Camera.
Configuration of KODAK Network ID Camera for connection with the Senographe can be
divided into two parts. One is to configure the serial channel for communication with the
Senographe, the other is to create the picture that will be printed on the film.
The Senographe is connected to the AUX connector at the back of the KODAK Network
ID Camera. The communication is set-up by entering set-up mode of the camera, please
refer to the Installation and Setup Manual. When in the communication set-up, press the
F1 key so that the word "Channel: AUX" is displayed in the upper rigth corner. The set-up
should now be set to:
Baudrate 9600
Parity Even
Databits 7
Protocol Senograp
As mentioned above when the different data available is shown the texts for a few items
can be changed (those marked with *). This is done by opening a new set-up window by
pressing Shift-F1 from this set-up window.
Creating the picture that will be printed on the film is done in the same way as usual
except that there is one extra field type available. The COMM field type. When such a
field is selected and enter is pressed an extra selection called COMM: appears in the
window were you select which kind of exposure data should be displayed in the field. To
build a picture you will have to define one COMM field for each exposure data to display.
Note that before you do this, the communication must be configured otherwise the
KODAK Network ID Camera does not know which data is available and will display None
for the COMM: field. The field data do not include the unit (kV mAs and so on). To add
that an F-text field with the appropriate text has to be inserted after the COMM field.
2.2.3.2 The Senogrape.
The Senographe DMR provides a serial channel through which the KODAK Network ID
Camera is connected.
The DMR has the serial channel built in but a rather expensive cable is needed to
connect the camera. This cable is about 10m long and contains a isolator which
electrically separates the Senographe from the KODAK Network ID Camera.
Additional an adaptor cable is needed to connect the GE provided cable from the
Senographe to the KODAK Network ID Camera since both the GE cable and the KODAK
Network ID Camera has 9-pin female connectors. This cable is made by connecting pin
2,3 and 5 between two 9pin male connectors.
Also, make sure that the software installed in the Senographe supports the DATAFLASH
connection.
If the correct Senographe software and hardware are installed the Senographe will
automatically configure it self for use with the KODAK Network ID Camera when the
KODAK Network ID Camera is connected.
2.2.3.3 The KODAK Network ID Camera.
Support for exposure data from GE Senographe was added as standard in version 2.1 of
the KODAK Network ID Camera software.

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If the Senographe is ready you will only need a standard equipped KODAK Network ID
Camera and a cable between the Senographe and KODAK Network ID Camera to make
it work.
2.2.3.4 Post-installation test.
After installation the configuration should be carefully tested. For all parameters which
presents values from a list it should be tested that all values will be presented. Remember
that you are not only testing the configurartion of the camera but also that the
Senographe is sending the correct value. For all numeric values you should make sure
that the longest possible value is presented correctly (for example all five digits of the
exposure time) and that the least significant digit is presented. Avoid if possible to use
values like 2000. It is better to test with a value like 2318.
2.2.3.5 Cable between KODAK Network ID Camera and Senographe
Parts
2DSUB 9 pin male connector
2A shielded housing to the above
1Shielded 3 wire cable
Connect the two connectors according to the folloing table.
9 pin male 9 pin male
2 2
3 3
5 5
2.2.4 GXDP-P/-NP
The General XRAY Data Protocol is a communication protocol intended to send xray
exposure data from xray equipment to Kodak Network ID Camera. The protocol is
designed to be flexible but still easy to implement. It was chosen to let the xray equipment
always send all it's data in a specified format and let the Kodak Network ID Camera
choose which data to display.
This specification divides the protocol into two layers where layer 1 is the transport
protocol responsible for ensuring that the data reaches its destination unchanged and
layer 2 is the data layer containing all the data. All communication is ASCII and control
codes are used for special purposes.
The GXDP-P protocol has two phases. The poll phase and the data transfer phase.
The GXDP-NP protocol has only the data transfer phase included, i.e. not poll phase is
performed.
We strongly recommends that the GXDP-P protocol is used because of its higher safety
level.
2.2.4.1 Poll phase
NOTE! This phase is NOT included in the GXDP-NP protocol.

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During normal operation the ID camera polls the xray equipment and gets an answer
back. The purpose is to allow the ID camera to check that the connection is not broken
and to be able to erase the data previously sent if that happens. If a single serial channel
is used to connect either a printer or a ID camera the presence of polling can also be
used by the xray equipment to detect that a ID camera is connected and not a printer.
The polling is performed by the camera sending ENQ (code 5) and should be
acknowledged by the xray equipment by sending and ACK (code 6) within 3 seconds.
The polling should be done at an interval not more then 5 seconds, 3 seconds is a
recommended interval. Connection with the xray equipment should not be considered lost
until three polls has failed. When connection cosidered lost, data previous sent will be
erased from the camera.
Note that it may happen that the ID camera sends its ENQ after the xray equipment has
started to send it's data message. As there is no synchronisation between the ID camera
polling and the data transmission from the xray equipment this can not be prevented.
Since the characters involved in the polling sequence are not used in the data transfer it
is easy to separate data transfer from polling. After the data is sent and the xray
equipment is waiting for the ACK from the ID camera, it may happen that the ID camera
sends an ENQ before the ACK and this ENQ must be acknowledged by the xray
equipment by sending an ACK within 3 seconds. At the end of this document there is a
pseudo program showing one solution to this problem.
2.2.4.2 Data transfer phase
The data is sent in a block with the following format:
STX Data area CSUM ETX
02H 1 to 100 chars 1 char 03H
Different checksums are used to ensure that GXDP-NP is not used on a system designed
for GXDP-P.
The checksum CSUM for the GXDP-P protocol is a sum of all data bytes excluding STX
and ETX modulo 96 plus 32 (CSUM=((add all chars of data area) MODULO 96) + 32.
The checksum CSUM for the GXDP-NP protocol is a sum of all data bytes excluding STX
and ETX plus 10 modulo 96 plus 32 (CSUM=((add all chars of data area+10) MODULO
96) + 32.
The modulo 96 plus 32 means that the checksum is represented by the characters
between 32 and 127 which are the printable characters of the 7-bin ASCII code. Note that
adding the data of the data area and doing the modulo operation have to be performed
using 16-bit operations.
2.2.4.3 Layer 2, data protocol
The data section consists of a list of data items and each item is represented by a
number identifying the data followed by a value. Each data item is separated from the
next by a semicolon ';' and the number is separated from the value by a colon.
Example:
"0:14;1: 2.4;2:Mo"
Unless there are any special reasons the value should be the value without unit, for
example 7kV should be sent as 7.