GSE Scale Systems - 123
Chapter 15 Communications Technical Reference Manual
the hardware handshake output of the unit is always
asserted and de-asserted when appropriate, regardless of
the selection for P204. This has been designed-in for
trouble-shooting purposes.
It is assumed that if you do not want to use the hardware
handshake line then you will not connect it. For this
situation it would not matter if the line changed state
during a transmission.
While in the Weighing Mode, the 574 checks its receive
buffer and processes any received data approximately
every 1/20th of a second. While in the Setup Mode, the
received data is processed more rapidly.
15.6 Communications (Transmit)
Operations
The 574 provides a customized transmit mode which can
be used to arrange up to 4 different transmissions to send
a variety of information to other devices. A custom
transmit can be made up of variable information
displayed or stored by the 574, fixed ASCII characters
and control codes. Up to 999 elements may be
programmed for transmission in each of the four custom
transmit setups, with each fixed character and
programmed parameter counting as one element. As a
maximum example, 12 parameters and 987 fixed discrete
characters may be programmed for transmission.
CREATING A CUSTOM TRANSMIT SETUP
Before attempting to set up a Custom Transmit,
determine ahead of time exactly what information you
want to send. Advance to the Custom Transmit Setup of
choice. For example, press <1> <0> <0> <0>
<SELECT> for the 1st Custom Transmit.
NOTE:
If entering this mode from the Weigh Mode, you will be
asked to enter the Software Security Code. Enter the
code as explained in Chapter 3 and the mode will be
advanced to the specified parameter, in this case P1000.
To insure a fresh start, you should clear out the previous
contents of the Custom Transmit Setup by pressing the
<CLR> key. The instrument will prompt you with "Key
# to CLR" which asks you to enter the number of
Custom Transmit Setup entries that should be deleted.
Since the maximum number of entries in the setup is
999, keying a number larger than this insures that any
previous setup is completely deleted. So, key in 1000
and then <ENTER>.
Enter the first element to be transmitted in the manner
described for text, control code, or parameter, in the
following sections. Repeat for each of the next elements.
When complete, you may want to review the Parameter
Setup in Chapter 4 for data transmission. When all
parameter setups are complete, press <ZERO> to exit
back to the Weigh Mode.
BASIC TRANSMIT INFORMATION
A default Custom Transmit is programmed into the
instrument at the factory. This may be useful for your
application. It may be modified to suit your purposes or
cleared completely. The unit is in an Insert Mode when
data is entered into a Custom Transmit Setup. Entered
data does not overwrite existing data. Instead, it is stored
at the current location within the Custom Transmit
Setup, immediately in front of the data that was at that
location before the entry was begun. If previously
entered data needs to be changed, you would first enter
the new data, then delete the old data by using the
<CLR> key.
There are several sub-modes of operation in the Custom
Transmit Setup Mode. These are:
Viewing the previously set up transmission and entering
new characters.
Expanding a special code to determine its setting.
Selecting a parameter to be transmitted.
Selecting the format for the selected parameter.
There are three different types of entries that can be
made into the Custom Transmit Setup.
Fixed Text
Control Codes and Extended codes such as carriage
returns, line feeds, etc.
Items such as Gross Weight, ID numbers, Date, Time,
etc.
These entries are explained in the following sections.
NUMERIC DISPLAY DURING SETUP
During the setup of a Custom Transmit, the numeric
display will show PXYYY. , where the X indicates the
number of the transmit (1-4), and the YYY indicates the
number of the current entry location (starting at location
000). For example, when the first character of the 1st
Custom Transmit Setup is displayed in the lower right
corner of the dot matrix display, the numeric display
would read P1000. When the fourth character of that
setup is displayed, the numeric display would read
SECTION - 15.6
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