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SPEEDBOX / ConnectorDetails-FrontPanel

Connector details (Front Panel)



Serial ports 1 and 2

9 way D-type male connector

Serial 1 and 2 connector pinout details
Pin Function
1 NC
2 Receive
3 Transmit
4 Secondary Transmit*
5 GND
6 Secondary Receive
7 Power in +12V supply
8 NC
9 NC

*The secondary transmit and receive ports are not implemented presently, these pins should be left as NC.


Pulse output

BNC 50 ohm connector

Pulse output connector details
Centre Signal 0=0V

1=5V

max 5mA

Shield GND  


Trigger input

BNC 50 ohm connector

Trigger Input details
Centre Signal <O.5V = low.

high => 2.1V

Internal pullup to 2.5V

Shield GND  

NOTE: There is an internal debounce on the trigger input which means that only one edge will be detected during the debounce period (50ms). As such, when triggering on thin laser barrier strips or short button presses it is important to trigger on the first edge which will be seen, otherwise the trigger signal can be missed.


CAN port

9 way D-type male connector. If two CAN ports are present on the front of the unit then they are internally connected in parallel, this makes connecting termination much simpler.

CAN port connector pinout details
Pin Function
2 CAN L
6 GND
7 CAN H
9 12v
Termination None Fitted
Dominant bit >2.5V difference
Recessive bit <0.9V difference

NOTE: No internal CAN termination is fitted within the SPEEDBOX, It is essential that the user fits appropriate termination if required. In general, if the SPEEDBOX is at one end of a two node CAN network with a CAN logging device at the other end, then the SPEEDBOX will need to be fitted with a 120Ω resistor between CAN H and CAN L in the cabling used to attach it to the network


Expansion port

9 way D-type male connector. Early units have an expansion port on the front and on the rear, if both are present only use one.

Expansion port connector pinout details
Pin Function Voltage range
1 SPI clock 0-5V
2 SPI in 0-5V
3 SPI out 0-5V
4 SPI chip select 0-5V
5 GND  
6 External GPIO 0-5V
7 +16V supply  
8 Timepulse output O-5V
9 External interrupt 0-16V transition level

approx lV, internal pull up


Analogue input

LEMO 4 pin connector part number FGG.0B.304.CLAD52Z

Analogue connectors pinout details
Pin Function Voltage range
1 Signal ground  
2 Input/Output -10 to + 10 output, 0-15V input
3 12v sensor supply  
4 Sensor supply GND  
Page last modified on July 12, 2016, at 03:53 PM