74
Address selection
Each annunciator needs to have a node address selected. This must be between 0 and 63. It is this
address that makes the annunciator unique and allows the external equipment to communicate to a
defined annunciator within a multi-drop system. The required node address should be converted to a
binary number to give the DIL switch settings with the least significant digit on S1 and the most
significant on S6.
Pushbutton selection
In systems that are connected to a remote device via the communications it is sometimes a
requirement for the pushbutton control to be provided externally via the communications port.
S7 on SIL switch SW1 is used to enable this feature. The local pushbutton will still be operational
even if this feature is enabled.
Selection
The table below indicates additional communication parameters that are available for configuration
by the user. All switches are set to off in the default conditions so it is only necessary to make
changes if the standard parameters do not suit the particular configuration. The master/slave
selection is only used when a P725 annunciator is using the serial communication link to
communicate to another P725 annunciator in a local/remote configuration as detailed earlier.
DIL Switch 2
SWITCH
FUNCTION
ON
OFF
SW2-1
Baud rate
4800
9600
SW2-2
Modbus protocol
RTU
ASCII
SW2-3
Parity
ODD
EVEN
SW2-4
Modbus master / slave
Master
Slave
All switches are factory set to off as default.
Option MOD C7 High Speed Communication Version
As an option the Communication port can be supplied as a high speed version with the following
selectable speeds.
SW2-*
FUNCTION
ON
OFF
SW2-1
Set communication baud rate
19200
38400
