Intermec CV30 Intermec Terminal Emulator (ITE) Programmer's Reference Manual - Page 16

Read Modified, Read Modified All, System Services Control Point (SSCP), Write

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Chapter 1 - About 3270 and 5250 Programming Note: Response times increase for this command because of the large quantity of data processed during the read buffer operation. Syntax: Description: Read Modified SNA/SDLC (Hex): F6 Asynchronous: 6 A major feature of the Read Modified command is null suppression. During read modified command operations, null codes are not sent. During a Read Modified command, all modified fields are transferred to the program. All nulls are suppressed during data transfer and thus are not included in the read data stream. As a field is modified by the operator, the MDT bit is set in the attribute byte for that field. Then, when a read-modified operation is performed, successive attribute bytes are examined for a set MDT bit. When the bit is found, the data in the associated field is read (with nulls suppressed) before the next attribute byte is examined. If the screen is unformatted the entire screen (nulls suppressed) is sent. Syntax: Description: Read Modified All SNA/SDLC (Hex): 6E Asynchronous: > Read Modified All is the same as the Read Modified command. Syntax: Description: System Services Control Point (SSCP) Asynchronous: 4 The SSCP command reads in new data from the host and places it at the current cursor position. If a 0x15 new line character is in the data, the computer performs a newline function. The SSCP command has no orders or WCC character associated with it and generates an unformatted screen. Syntax: Description: Write SNA/SDLC (Hex): F1 Asynchronous: 1 A Write command from the host computer consists of a command code, a WCC, and any orders or new buffer data (or both) required to modify the existing buffer contents. Execution of the Write command is in two steps: 1 The WCC is processed. 2 Buffer data and orders are processed. Data may be any ASCII character in the range of 0x20 to 0x7E, and must define the character content of a field. Buffer data characters may be written into any buffer location without erasing or modifying data in other locations. Data is stored in successive buffer locations until orders alter buffer addresses, or all data is entered. 4 Intermec Terminal Emulator (ITE) Programmer's Reference Manual

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Chapter 1 — About 3270 and 5250 Programming
4
Intermec Terminal Emulator (ITE) Programmer’s Reference Manual
Read Modified
Syntax:
SNA/SDLC (Hex):
F6
Asynchronous:
6
Description:
A major feature of the Read Modified command is null suppression. During read
modified command operations, null codes are not sent.
During a Read Modified command, all modified fields are transferred to the
program. All nulls are suppressed during data transfer and thus are not included in
the read data stream. As a field is modified by the operator, the MDT bit is set in the
attribute byte for that field. Then, when a read-modified operation is performed,
successive attribute bytes are examined for a set MDT bit. When the bit is found, the
data in the associated field is read (with nulls suppressed) before the next attribute
byte is examined. If the screen is unformatted the entire screen (nulls suppressed) is
sent.
Read Modified All
Syntax:
SNA/SDLC (Hex):
6E
Asynchronous:
>
Description:
Read Modified All is the same as the Read Modified command.
System Services Control Point (SSCP)
Syntax:
Asynchronous:
4
Description:
The SSCP command reads in new data from the host and places it at the current
cursor position. If a 0x15 new line character is in the data, the computer performs a
newline function. The SSCP command has no orders or WCC character associated
with it and generates an unformatted screen.
Write
Syntax:
SNA/SDLC (Hex):
F1
Asynchronous:
1
Description:
A Write command from the host computer consists of a command code, a WCC,
and any orders or new buffer data (or both) required to modify the existing buffer
contents. Execution of the Write command is in two steps:
1
The WCC is processed.
2
Buffer data and orders are processed.
Data may be any ASCII character in the range of 0x20 to 0x7E, and must define the
character content of a field.
Buffer data characters may be written into any buffer location without erasing or
modifying data in other locations. Data is stored in successive buffer locations until
orders alter buffer addresses, or all data is entered.
Note:
Response times increase for this command because of the large
quantity of data processed during the read buffer operation.