7 error conditions and service requests – LumaSense Technologies INNOVA 1309 User Manual
Page 29
Chapter 3
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BE1285-15
1309 Multipoint Sampler
LumaSense Technologies A/S
Page 29 of 42
3.7 Error Conditions and Service Requests
If an error arises in the 1309’s hardware, processor system or software,
the 1309 can signal the system controller by generating a Service Re-
quest. The exact nature of the error condition can then be investigated
by using the Warning? or Error? interface jobs.
3.7.1
The Status Byte
The status byte is an eight-bit byte, read out by the system controller
as part of the serial poll sequence. The status byte gives the first indi-
cation of the cause of the service request. The status byte for the 1309
is shown in Table 3.3. For an error to generate a Service Request, the
corresponding bit in the status byte must be enabled to request ser-
vice. The procedure for this is described in the following section.
When a service request is enabled, all bits in the status byte except bit
6 are reset by a serial poll read-out or resetting the status byte. Bit 6 is
only reset when the abnormal condition of the 1309 (identified by the
Warning? or Error? interface jobs,
sections 3.7.4
to
3.7.5
) is corrected.
When a service request is generated, bit 7 of the status byte is always
set; it cannot be disabled.
Table 3.3 The 1309’s Status Byte showing the error conditions which
results in the individual bits being set
Status Byte
Error Condition
Bit no.
Dec. Val-
ue
1
1
Not used
2
2
Set when the 1309 has completed a reset
3
4
Set when the 1309 has completed an inter-
face job
4
8
Not used
5
16
Set when the 1309 has not completed the
previous interface job when a new job is
read-in
6
32
The 1309 is in an abnormal condition. The
interface jobs Warning? or Error? give more
information about the abnormal condition –
see
sections 3.7.4
and
3.7.5
.
7
64
Indicates the 1309 has set the interface
SRQ line
8
128
Not used