RS232 connection to PC
inoperative
Check :
• RS232 maximum of 15 m is not exceeded
• Direct to PC connection requires a Crossover (NULL
modem) RS232 cable
• Baud rate of controller and of master device are the same
• Slave ID of the controller is the same as configured in the
master device
RS232 connection to GSM
modem inoperative
Check :
• RS232 maximum of 15 m is not exceeded
• Modem Initialisation strings in the DSE configuration is
correct for the connected modem type
• Modem is configured to 9600 baud
• SIM card is CSD (circuit switched data) compatible
• SIM card is not PIN locked
• SIM card is correctly inserted
• Antenna is correctly installed and is not inside an earthed
metal cabinet / control panel
• A good signal is available in the locality
RS232 connection to landline
modem inoperative
Check :
• RS232 maximum of 15 m is not exceeded
• Modem Initialisation strings in the DSE configuration is
correct for the connected modem type
• Modem is configured to 9600 baud
RS485 inoperative
Check:
• Connection cable – Belden 9841 or equivalent
• 120 Ω termination resistors are correctly fitted
• Baud rate of controller and of master device are the same
• Slave ID of the controller is the same as configured in the
master device
DSENet inoperative
Check:
• Connection cable – Belden 9841 or equivalent
• 120 Ω termination resistors are correctly fitted to the last
expansion module only.
• Slave ID of the expansion module is the same as configured
in the modules configuration.
Ethernet comms direct to PC
inoperative
Check :
• Ethernet rated cable is used
• Direct to PC connection requires a CROSSOVER cable.
• Check the IP address of the DSE controller is correct
• Check the PC is not set to obtain IP address automatically
• Check PC firewall allows traffic on the configured port.
Ethernet connected to a
router.
Check :
• Ethernet rated cable is used
• Router connection requires a straight through’ cable.
• Check the IP address of the DSE controller is correct
• Check all firewalls and routers allow traffic on the configured
port.
• Test the controller connected directly to a PC for test
purposes to eliminate router problems.
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