IBM 6400 Programmer's Reference Manual page 45

The following pages describe the device control command set commands in
detail.
Acknowledge Reply (ACK)
Length D6FF Flag
The printer uses the Acknowledge Reply to return device status, sense
information, and any additionally requested information back to the host
application program.
The application program uses the Acknowledge data to maintain control of the
printing application and to begin error recovery actions when necessary.
The printer sends an acknowledgment:
The Acknowledge Reply is returned to the host in the standard IPDS command
format although it goes from the printer to the host. A negative response has
priority over a positive response.
If the printer can identify the command and the command has a correlation ID,
the Acknowledge Reply contains a correlation ID that matches the command.
Table 6 (Page 2 of 2). Device-Control Commands and Orders
Name Command
XOA Execute X D633
'
Order Anystate
XOA Discard
Buffered Data
XOA Request
Resource List
XOA Exception
Handling Control
XOA Print
Quality Control
XOH Execute X ' D68F
Order Homestate
XOH Print
Buffered Data
XOH Erase
Residual Print
Data
XOH Set Media
Size
XOH Obtain
Printer
Characteristics
Correlation ID
(Optional)
When the Acknowledgement Required (ARQ) flag bit in the command the
•
printer receives is set to 1.
When the printer detects a command stream error or device error and must
•
send a negative response (NACK).
Order
'
X F200
' '
X F400
' '
X F600
' '
X ' F800 '
'
X ' 0100 '
X 0500
' '
X 1700
' '
X F300
' '
DATA
Chapter 3. IPDS Commands Reference
Device Control Command Set
Disposition
See "Execute Order Any State
(XOA)" on page 46
See "Discard Buffered Data
(DBD)" on page 46
See "Request Resource List
(RRL)" on page 47
See "Exception Handling Control
(EHC)" on page 48
See "Print Quality Control
(PQC)" on page 49
See "Execute Order Home State
(XOH)" on page 50
See "Print Buffered Data (PBD)"
on page 50
See "Erase Residual Print Data
(ERPD)" on page 50
See "XOH Set Media Size
(SMS)" on page 51
See "Obtain Printer
Characteristics (OPC)" on
page 52
29