DSE Model 5310 Automatic Mains Failure & Instrumentation System Operators Manual
Part No. 057-013 5310 OPERATING MANUAL ISSUE 7.1 18/06/2007 ADM 61
14.8.4 RS485 LINK TO CONTROLLER
The RS485 enabled 5310 modules are able to communicate with a PC or other RS485 enabled device over a
standard RS485 connection. Typical uses of RS485 are:
• Direct connection to a remote PC running the 5xxx series configuration software. RS485 is capable of
communication over a distance of 1.2km where suitable 120
Ω RS485 cable is installed.
• Connection to a building management to allow mains, generator and engine parameters/alarm conditions to be
displayed along with information from other devices (air conditioning, fire alarm system etc).
NOTE: - The RS485 system will comprise of one MODBUS master (typically a PC) and up to 31
MODBUS slaves. The 5310 modules are always MODBUS slave devices. To ensure correct operation a
suitable 120Ω terminal resistor must be fitted to each end of the RS485 connection bus.
Caution! - The A and B lines of the 485 network should be terminated at each end with a 120Ω
resistor.
Some RS485 devices (PC cards in particular) are already fitted with a terminating resistor. However if
they are not installed as an ‘end of line’ device then such terminating resistors must be removed. Other
RS485 devices may be fitted with a ‘switchable’ resistor, again this must be switched out if the device is
not installed as an ‘end of line’ device.
Typical connections of
RS485 PC system
(master) to RS485 DSE
controller (slave)
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