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5.2 Request commands
Request commands can be sent from the RCS to the RCM or vice versa. The answer of a request com-
mand does not include the status information.
Command "R": Calling for Address
Description: Request for an address.
A
RCS that is not provided with an address will send requests for an address at regular
intervals.
This message uses the command
R. It will be received by the RCM and signals the need
for a new addressing procedure.
Example: An
RCS of class m asks for an address:
Message <STX> <TYPE> <ADDRH> <ADDRL> <Body> <STATH> <STATL <CHKH> <CHKL> <ETX>
m0 0 R bf
Command "A": Addressing Procedure
Description: Each member of the remote control chain must have a non-ambiguous address so that
functions can be specifically triggered in the individual devices. The addresses are as-
signed by an initial addressing message. Since all devices of a certain class have to be
given a non-ambiguous address, and since at the beginning the
RCM does not know how
many devices exist, the command uses as
<ADDRH> <ADDRL> the "00".
Message <STX> <TYPE> <ADDRH> <ADDRL> <Body> <STATH> <STATL <CHKH> <CHKL> <ETX>
m0 0 A 0e
The addressing message uses the command A. In the above example all
RCS of class m are addressed.
The first
RCS increases the number. The resulting number is his individual address. Afterwards he cal-
culates the new checksum and passes this modified message to the next device. Each device conse-
quently increases the numbers before passing the message again. The last
RCS passes the message back
to the
RCM. (The maximum number of RCS in a class is 98). The addressing procedure must be carried
out separately for all types of
RCS in the remote control ring.
Example: Let's consider a class of H
ERMES DXD consisting of 3 devices. They all have to get their non-
ambiguous address by the initial addressing message. The message passed by the last
RCS back to the
RCM informs the RCM about the number of devices of this class.
RCM RCS1 RCS2 RCS3
passes
m00A0e
receives
m00A0e
passes
m01A0f
receives
m01A0f
passes
m02A10
receives
m02A10
passes
m03A11
receives
m03A11
Answer <STX> <TYPE> <ADDRH> <ADDRL> <Body> <STATH> <STATL <CHKH> <CHKL> <ETX>
m0 3 A 11