Appendix E Extended Remote Connections
BD600+ Profanity Delay
Appendix E Connections
Page 47
Document Version 2.1
Parallel Outputs
The parallel outputs are of the open-collector type, meaning that when active, the output is pulled to
ground by a transistor. A 5V supply capable of a maximum of 500mA is available on the connector,
along with a clamp input that may be useful when driving relays.
The outputs can handle a maximum voltage of +50V DC in the off state and a maximum current of
0.5A per output in the on state (0.2A if all outputs driven) – operation above these limits will damage
the output circuitry. It is recommended that suitable relays be used to handle currents and voltages
above 100mA/25V to protect the unit from possible damage or overheating.
(1) Chassis Ground
(6) Ground
(11) Ground
(16) Out 10
(21) Out 14
(2) Out 1
(7) Out 5
(12) Ground
(17) Out 11
(22) Out 15
(3) Out 2
(8) Out 6
(13) +5V 0.5A
(18) Out 12
(23) Out 16
(4) Out 3
(9) Out 7
(14) Ground
(19) Ground
(24) Ground
(5) Out 4
(10) Out 8
(15) Out 9
(20) Out 13
(25) Clamp
Notes
None of the ground connections may be used as a safety ground – they are rated for low current
DC operation only.
The Chassis Ground connection (1) may be used as a screen connection. It should not be connected
otherwise.
If the +5V 0.5A supply (13) is used, output loads need only be connected from here to each output.
These would typically be LED indicators with suitable series resistors or small 5V relays.
If an external power source is used, its –ve side should be connected to ground (6,11,12,14,19,24)
and its +ve side be used as the power source. Output loads should be connected between the output
signal (Out 1, etc) and the power source. The grounds are connected together inside the unit - for
low currents only one need be used.
The clamp signal (25) is the common cathode connection for clamping diodes connected to each
output. If this is connected to the power source, it will prevent the voltage on each output from ex-
ceeding the power voltage. This would mainly be used for back-emf protection when driving relays
or other inductive loads.
The driver chips for these outputs are socketed so that they can be easily changed if damaged –
U110 handles OUT1-4, U112 handles Out5-11, U111 handles Out12-16.
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