9.5 Outputs
9.5.1 Supervised Outputs TB3
Four supervised output are provided on the Main Board. These supervised switched outputs supply
a nominal 24VDC, at up to 750mA. Outputs are independently controlled and supervised.
Supervision of the outputs for short, open and earth faults applies in both the ON and OFF state.
The supervised outputs use a 10K resistor as an end-of-line device. Line conditions are supervised
as outlined below. Dependant on the usage of the input some conditions may be ignored.
*The open circuit threshold in the ON condition may vary significantly with tolerance and temperature
approximately ranging between 11K and 20K. Termination is via a 5mm pitch screw terminal block.
9.5.2 Relay Outputs TB4
Three relay outputs are provided. These outputs are designed to be able to switch loads considered
to be predominately resistive as listed below.
The relay contacts are “voltage free” and have some degree of protection in reference to the system
voltage. Termination is via a 5mm pitch screw terminal block.
9.5.3 Auxiliary 24VDC Outputs TB1 & 5
Programmable Continuous / Re-settable (11 seconds) independently switched 24V DC (nominal) 1A
output.
Each auxiliary output is supervised for continuity of power output hence a short circuit on the output
terminal will register as a fault. Overload circuit protection is also included to prevent a short circuit
on the output from damaging the system. Termination is via 5mm pitch screw terminal block.
9.5.4 Low current outputs TB6
Two low current open collector outputs suitable for driving the coil of a relay are provided.
The outputs are capable of supplying a minimum of 30mA but no more than 300mA when an
overload is applied for more than 5 seconds.
Debug Connection CN6 & 11
The main board provides a debug connection with only one connection being operational.
Universal Serial Bus Connection CN6
A Universal Serial Bus connection is provided. Generally this will be for connection to a laptop.
Compatibility will be to USB standard V2.0 minimum. Termination is via a USB Type B connector or
USB Type B connector.
RS 232 Connection CN11
A serial connection compatible with RS232 standard is provided. The serial port is DTE style (Device
Terminal Equipment) which enables connection to a MODEM communicating at up to 115,200 bps.
The communication lines are
TXD - Transmitted data from system.
RXD - Data received by system.
The following lines can also be provided.
RI - Ring indication
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