Printronix S828, Programmer'S Manual

Page: 119 / 424

Programmer Manual PTX ‐ S828
Chapter 5 IPDS Programming Information 117 260071 ‐ 001A
Byte Field Description
4 Flag Bit 0
0 = Acknowledge Response Not Required
1 = Acknowledge Response Required
Bit 1
0 = Correlation ID Not Included
1 = Correlation ID Included
Bit 2
0 = Acknowledge Reply Response is Complete
1 = Second Buffer of XOH - OPC Reply Required
Bit 3 - 6
Reserved (Always Zero)
Bit 7
0 = Persistent NACK is inactive
1 = Persistent NACK
5-6 Correlation ID Identifier Name (Valid Only if Byte 4, Bit 1 Is On)
7-n Data Specific Subcommands, Operands, Parameters, and Data Fields as Appropriate for
the Given Command
Notes:
1. Bit numbering follows the EBCDIC convention with bit zero being the most significant bit.
2. If the Correlation ID field is not present (byte 4, bit 1 is zero), the data field starts at byte 5 instead of
byte 7.
3. Both positive or negative values fitting in the data fields are allowable. Negative values are in
twos-complement form.
4. Some bits or bytes in the data fields are Reserved. The printer does not always check the contents of
these fields. However, Printronix recommends that such fields equal the specified value (if one exists) or
zero.
5. The printer will not detect a condition where the specified command length (bytes 0 through 1)
exceeds the actual number of bytes received. If this occurs, the printer will not process the command
until the printer receives the specified number of bytes.
6. If the host wants to request the second buffer, the request must be the next command following the
request for the first buffer of an acknowledgment. However, it is not required that the host request the
second buffer of an acknowledgment.
Supported IPDS Command Codes
Command
Hex Code Description
SHS D697 Set Home State
STM D6E4 Sense Type and Model
NOP D603 No Operation
LSS D61E Load Symbol Set
XOH D68F Execute Order Home State
XOA D633 Execute Order Any State
BP D6AF Begin Page
EP D6BF End Page
LCC D69F Load Copy Control
LPD D6CF Logical Page Descriptor