Responses - GE VersaPoint IC220PBI002 User Manual

Responses

A response is sent after every request. The response indicates that the request
has been received and shows its current status:
Response Structure:
Byte 1
Byte 2
Byte 3
...
Byte n
The status is indicated when local PCP transmission is complete and in the event
of an error. In the event of an error, the data block can provide details. An error
has occurred if the value of the status byte does not equal 00
00
44
For the Virtual C1 module, the parameters have the following meaning:
<Module number>
The NIU counts as module 0, the first configured module as 1, the second as 2,
etc. Only devices with diagnostics should be configured and are "active" devices in
the station.
<Index high and Index low>
Specifies the object index of the addressed object in two bytes. This also applies
for objects on the NIU. For example, for index 5FE0
entered for Index high and E0
Index high and 04
<Subindex>
The subindex can be used to select a specific element from an array or record.
The NIU has no arrays or records, so subindex 0 should be entered.
<Length>
Specifies how many bytes of object data (object contents) follow. Depending on
the module, this may be NIU object data or I/O module object data.
<Data block>
This is only the content of an object. The length and scope of the data are
described by the <Length> parameter.
<Invoke ID>
The Invoke ID is one byte in length and is used for channel selection on some
modules.
GFK-1911B Chapter 8 Communications
Service (response bit is set)
Status, if required
Length, only on first read response
Data block, if required
No error
hex
PCP module error
hex
for Index low. For index 4
hex
is Index low.
hex
.
hex
the value 5F should be
hex hex
on the NIU, 00
hex
8
is
hex
8-21