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Part No. 057-129 DSE871x mono remote display ISSUE 2.1 21/09/2010 ADM
27
4.6.6 RS232 SERIAL PORT
NOTE:- The RS232 port instrument shows status of the host controller’s (8710/8760) serial port.
This section is included to give information about the RS232 serial port and external modem (if connected).
The items displayed on this page will change depending upon configuration of the module. You are referred to your
system supplier for further details.
NOTE:- Factory Default settings are for the RS232 port to be enabled with no modem connected,
operating at 19200 baud, modbus slave address 10.
Example 1 – Module connected to an RS232 telephone modem.
When the DSE8710 series module is power up, it will send ‘initialisation strings’ to the connected modem. It is
important therefore that the modem is already powered, or is powered up at the same time as the DSE87xx series
module. At regular intervals after power up, the modem is reset, and reinitialised, to ensure the modem does not
‘hang up’.
If the DSE8710 series module does not correctly communicate with the modem, “Modem initialising’ appears on the
Serial Port instrument screen as shown overleaf.
If the module is set for “incoming calls” or for “incoming and outgoing calls”, then if the modem is dialled, it will
answer after two rings (using the factory setting ‘initialisation strings)’. Once the call is established, all data is
passed from the dialling PC and the DSE8710 series module.
If the module is set for “outgoing calls” or for “incoming and outgoing calls”, then the module will dial out whenever
an alarm is generated. Note that not all alarms will generate a dial out; this is dependant upon module configuration
of the event log. Any item configured to appear in the event log will cause a dial out.
Press down
to view the modem status....
Indicates that a modem is configured. Shows ‘RS232’ if no
modem is configured.
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