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3.10.7 Configuration Commands
HT changes the machine configuration and must be followed by 2 characters of the
form 01PVHFCS and 01LEIBDQ where:
P = 1: Permanent configuration change.
0: Change just for one document
V = 1: 5 lines/inch vertical spacing
0: 6 lines/inch vertical spacing
H = 1: 12 characters/inch horizontal spacing if S=0
0: 10 characters/inch horizontal spacing if S=0
F = not used, set to 0
C = 1: Correspondence quality print if S=0 and D=0
0: Normal print if D=0
S = 1: 17 characters/inch horizontal spacing
0: Horizontal spacing determined by H bit
L = 1: Lock keypad from modifying set up parameters
0: Unlock keypad for modifying set up parameters
E = 1: Document present set by ENTER key after insertion
0: Document present set automatically after insertion
I = 1: Insertion initiated by DOWN key
0: Start insert _ seconds after document sensed in tray
B = 1: Insertion to bottom edge
0: Insertion to top edge
D = 1: Fast Draft printing
0: Print speed determined by C bit
Q = 1: Quieter print on thin documents
0: Darker print on thick documents
All parameters configurable by an HT are also programmable from the keypad. See 3.5.1. The
HT command is unique to C mode.
3.10.8 Status and Keypad Commands
Status, key buffer contents, line count or document length data are transmitted when
requested by the host. These C mode commands except for document length and line count
requests may be used in I mode by preceding them with an ESC.
ENQ requests printer status and is executed when it is received.
SUB also requests printer status but it is only executed after all previously received
commands have been executed. SUB may be used to interrupt the host and notify it
that the printer is now idle.
Printer status is a single byte that is bit significant as follows:
0 1 DP XE DJ KB BZ BA
DP = Document present. Set whenever a document is in the feed path.
XE = Transmission error. The character associated with the error will be printed as a
“@” for parity errors or a “~” for framing errors.
DJ = Document jam. The printhead has not returned to the document edge correctly
and operator attention is required.
KB = Key buffer. The key buffer contains keystroke information that will be transmitted
upon receipt of a DC1.
BZ = Busy. Either printing or document movement is now occurring.
BA = Input buffer available. At least 1000 characters of space are available in the input
buffer or the buffer is empty. Buffer operation is detailed in 3.12.1.
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