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173
Standard Mode
Section 4-23
Values can be:
-
Message numbers
-
Mask numbers (mask 8000
H
)
-
Control codes
4.22.5 Polling Time
The polling time is the frequency with which the variables for the cyclic poll area are
to be read by the operating terminal. This setting is specified in the system para-
meters for the poll area. Polling of this variable includes the Write Coordination
Byte, the Serial Message Channel and the Image of the status LED. With most
protocols, settings of around half a second have worked well. If the setting for the
cycle time is too short, the interface protocol can no longer meet the requirements
resulting in poorer reaction times. There is no general recommendation since the
options depend on the user description involved. Time settings should, however,
be at least greater than 100 ms.
4.22.6 Size of the Poll Area
The maximum size is 23 bytes depending on the data type and type of terminal. The
poll area size can be adapted to the area that is actually used if the image of the
LED or part of this function is not to be used. The default size for all operating
terminals is 12 bytes.
4.23
Control Codes
Control codes have already been mentioned in the previous sections which can be
used to trigger certain actions or functions in the operating terminal. All of these
actions are initiated by the controller by writing the desired control code to the serial
message channel within the poll area.
An explanation of these control codes is provided below.
4.23.1 Triggering Data Set Printouts
The following hex code can be used from the controller to cause the current data set
to be output to the printer connected to the operating terminal.
Hexadecimal code:
7FF8
H
The operating terminal can indicate the status of the print process by writing either
of two values to the address for the recipe number variable.
0
Data set printout ok.
255
Data set with the desired data set number can not be printed.
4.23.2 Setting the Clock in the Operating Terminal
The following hex code can be used from the controller to cause the real-time clock
in the operating terminal to be set in accordance with the specifications in the de-
fined control word.
Hexadecimal code:
7FF9
H
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 ...
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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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