FORMATTING AND MANAGEMENT OF
1.H
STANDARD DATA TRANSMISSIONS
specified HEADER or TAILER string (respectively). However, System 10 will not
answer a keyboard-entered interrogation of HDR [CR] or TLR [CR]—i.e., a bill-
board display of the current HEADER or TAILER string will
not appear.
Table 1.3 Hexadecimal Coding of ASCII Control Characters
ASCII ASCII
Character Hex Character Hex
NULL 00 DLE 10
SOH 01 DC1 11
STX 02 DC2 12
ETX 03 DC3 13
EOT 04 DC4 14
ENQ 05 NAK 15
ACK06 SYNC 16
BELL 07 ETB 17
BS 08 CAN 18
HT 09 EM 19
LF 0A SUB 1A
VT 0B ESC 1B
FF 0C FS 1C
CR 0D GS 1D
SO 0E RS 1E
SI 0F US 1F
USE OF HEADER OR TAILER TO PROVIDE
NONSCROLLING “DATASTREAM” DISPLAY
You may use the HEADER (HDR) or TAILER (TLR) command to prevent scrolling
of successive data sets transmitted to a CRT terminal via the
STREAM (STR)
command—and thus to achieve in-place updating of all data within one displayed
set.
Simply include the [HOME] character as the first character in the HEADER string,
or as the
final character in the TAILER string. This will automatically drive the CRT
cursor to the upper left corner of the screen, so that the display of each transmit-
ted data set will begin at the same place.
However, since there is no universal ASCII
[HOME] character, you will have to
consult the literature accompanying your printer or terminal to find the specific
CONTROL CHARACTER which it will recognize as
[HOME]. The corresponding
hexadecimal word (in square brackets) will be what you actually enter in your
HEADER or TAILER string.
d. CHARACTERS PER CHANNEL: CPC
To format the DATA FIELD for all STREAM (STR) and HARD COPY (HCY) trans-
missions, you may use the
CHARACTERS PER CHANNEL (CPC) command:
CPC = n [CR]*
where “n” is the desired number of character spaces you wish to constitute the
data field for each channel transmission (including leading spaces). It may be any
integer from 2 through 9, and is initially set at “8.”
Commanding, for example,
CPC = 9 [CR]*
1-50
1.H.3 FORMATTING OF TRANSMISSIONS
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