Manual
RF-Gateway RS485 Typ APG03B-RS485
Omnio AG - RATIO® - radio bus system
Manual RS485-Gateway bidirectional
17.12.2008, Seite 8/ 19
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3.1.4
Bus Conflicts -Telegram Repeats
Bus conflicts have different causes, some of them are, for example, a false cable type of the RS485
bus cable, a user device that is not – or incorrectly – connected, or a baud rate that has been set
incorrectly.
Bus conflicts are solved such that a missing answer or acknowledgement telegram ACK to a telegram
(inquiry or command) will be repeated up to two times. The breaks between two repeated telegrams is
between 500 and 1000ms. After the third attempt, if no answer acknowledgement telegram ACK is
received, the telegram is discarded and the next command is processed.
3.2 Telegram Types
The following table describes the telegram flow and the possible telegram types which are specified by
the value in the byte
type
(see Telegram Structure 3.1.1):
Flow direction Value Description
Remark
Gateway->
Master
0B
RRT
R
adio
R
eceive
T
elegram
A telegram from a radio transmitters
has been received through the gateway
and sent to the RS485 bus. The
telegram must be acknowledged by the
Master.
Master ->
Gateway
6B
TRT
T
ransmit
R
adio
T
elegram
A telegram from the gateway
(addressed by the user number) to the
Master. The telegram must be
acknowledged by the Master.
Gateway ->
Master
8B
RMT
R
eceive
M
essage
T
elegram
A telegramm from the gateway
(addressed by the user number) to the
Master. The telegram must be
acknowledged by the Master
Master ->
Gateway
AB
TCT
T
ransmit
C
ommand
T
elegram
A telegram from the Master to the
gateway itself (addressed by the user
number). The gateway will
acknowledge the telegram or send an
answer telegram to the Master.
3.2.1
Possible Transmission Types of an RRT Telegram (Type = 0B)
The telegrams of different radio transmitter differ by one value in the ORG field. These are:
Wert
Beschreibung
05
A TG of a transmitter with a PTM module
06
A TG of a transmitter with a STM module 1Byte
07
A TG of a transmitter with a STM module 4Byte
08
A TG of a transmitter with a CTM module
The data sheets of the sensors include detailed descriptions of the telegrams of the various sensors.
3.3 Telegrams in Detail / Release Notes
See Appendix A. All possible telegrams are listed there which can be used in the current SW release.
Master
Gateway
Gateway
