Exception Handling Control (Ehc) - IBM 6400 Programmer's Reference Manual

Device Control Command Set
3. Bytes 8 and 9 are ignored when the resource type is ALL.
4. Exception ID 0291..02 in bytes 6 and 7 are for invalid values. If either value is
Acknowledge Reply for Request Resource List
The format of the resource list returned with the Acknowledge Reply is as
follows:
Notes:
1. Bytes 2-6 repeat for each resource type.
2. The RRL reply is limited to 80 resource entries (maximum). See "Code Page

Exception Handling Control (EHC)

An exception (error) exists when the printer detects an invalid or unsupported
command, control, or parameter value in the data stream received from the host.
The IPDS structure provides Alternate Exception Action (AEA) when the printer
receives a valid parameter value, but the printer does not support this value.
The Exception Handling Control subcommand allows the host control of
exception handling by the printer. This subcommand specifies the action the
printer is to take with respect to the reporting and processing of exception
(error) conditions. The format of the EHC subcommand is:
48
6400 IPDS
unsupported, then the query is not understood and the reply is a single entry
that sets the resource type to zero, echos other values, and sets the
resource size to zero (not present).
Length D6FF Flag
Table 26. Resource Reply List
Byte Value
0 X FF
' '
1 X 01
' '
X 06
' '
2
X 00
' '
X ' 01 '
X ' 04 '
X 05
' '
X FF
' '
3
X 01
' '
4
X 00
' '
X 01
' '
5-6 X xxxx
'
ID Values" on page 36 for a complete set of supported CPGID/FGID
combinations.
Correlation ID
(Optional)
Description
Unordered List
End of List
Length of this Entry
Resource Type
Resource Size=0. The queried Resource
Type, ID Format, or ID is unknown,
unsupported, or inconsistent
Single Byte Coded Font
Page Segment
Overlay
Resource Size=0. The List Query
requested is not supported
Resource ID Format (RIDF)
Host-Assigned Resource ID
Resource Size Indicator
Resource not present
Resource present
Resource ID
'
Data