Sony BKM-FW50 Service Manual page 29

Category
Contains the category number of display equipment to be
controlled. A category number is confirmed on the display
equipment side. A request is ignored when a different
category number is contained.
Code Category
10h Information Display (FWD series)
2. Community
A request is executed when community coincides with the
community set in display equipment. Community consists
of four (upper- or lower-case) alphanumeric characters.
For BKM-FW50, "SONY" is a factory-setting value.
The set character can be changed on the Web page.
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Community (32)
Community packet
n
Community necessarily consists of four alphanumeric
characters.
3. Command
The format of a request packet and response packet is
described below.
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Item No(16)
Request/Response(8)
Command packet
4. Request
The format when sending a request from a host to display
equipment is described below.
Community
This is the same alphanumeric character as the community
set in display equipment that sends a request.
Request
This is a request for display equipment.
Item No.
This is the item number to be treated for request.
Data Length
This is the length of data incident to a request. The
maximum length is 128 bytes. The length of data is "0"
when no data exists.
Data
This is data incident to a request.
BKM-FW50
(Bit position)
2 3
7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2 3 (Bit position)
7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
Data Length(8)
5. Response
The format when display equipment returns a response to
the request from a host is described below.
Community
This contains the same alphanumeric character as a
request. For a short header and short community, this is
embedded with 00h.
Response
This contains the result of a request.
Item No.
This contains the same value as a request.
Data Length
This is the length of data incident to a response. The
maximum length is 128 bytes. The length of data is "0"
when no data exists.
Data
This is data incident to a response.
5-7-4. Requests and Responses
Requests and responses are described below.
1. Requests
Requests are only a GET request that gets the display
information or state and a SET request that changes the
setting of display equipment.
Request Contents
SET (00h) Writes data in the register of display equipment.
GET (01h) Gets the installation information, equipment
state, or setting values.
SET command
Communication with the main microcomputer of display
equipment can be done via a network by using the protocol
dedicated to FWD series as well as an ID Talk protocol.
Use a SET command in this case. (Also, use a SET
command when receiving information from the main unit
of display equipment.)
2. Responses
A response returns the result of execution to the request
from a host.
Response Contents
NG (00h) Indicates that a request is invalid or could not
be executed.
OK (01h) Indicates that a request could be executed
normally.
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