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Data Type
The Modbus Data Type may be selected from:-
AN3135 Style Point
Point
State
State must be selected.
Reference Appendix B for a complete description of these Data Types.
Transmit Controls
If this option is selected, Acknowledge and Reset Pushbutton controls will be
transmitted along with point data. (When communicating between two
Annunciators, only one Annunciator may be set to Transmit Controls. As a
default, the Annunciator will always accept or receive pushbutton controls from
another device regardless if the Transmit Controls option is selected.
The Series 90A can transfer annunciator controls (ACK and RST) via modbus.
This can be done in two modes of operation, namely 3135 and Point data. In
Point mode the controls are within register 16 after 15 registers of alarm points.
In 3135 they are in register 5 after 4 of alarms. To avoid overwriting when master
and slave are using the same register addresses the bits used to transfer the
controls are different between master and slave mode. The bits used are
indicated in the table below.
Slave
Master
Modbus Type
This is a format in which the data is transmitted. Can be set to ASCII or RTU.
Series 90B ANNUNCIATOR INSTALLATION AND CONFIGURATION MANUAL
RST
ACK
incoming
incoming
0x0001
0x0002
0x0004
0x0008
RST
ACK
outgoing
outgoing
0x0004
0x0008
0x0001
0x0002
i.
85
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