The conveyor communicates with other machines through a SMEMA (Surface Mount Equipment Manufacturers Association) interface. SMEMA is an equipment standard for single board transfer for manufacturing systems of surface-mounted printed circuit boards. Reference the following chart for interface function.
Upline / Downline Pins Notes
Upline 1 & 2(Output Signal) Will be at low resistance (contacts closed) when conveyor is asking for a board.(SMEMA: not busy) Will be at infinity (contacts open) whenconveyor is not asking for a board (SMEMA: busy)
Upline 3 & 4(Input Signal) Machine upline will provide contact closure (short pins 3 & 4) to start the transfer-inprocess. (SMEMA: board available)
Downline 1 & 2(Input Signal) Machine downline will provide contactclosure (short pins 1 & 2) to indicate itwants a board.(SMEMA: not busy)
Downline 3 & 4(Output Signal) Will be at low resistance (contacts closed)when conveyor has a board to transfer out. (SMEMA: board available)Will be at infinity (contacts open) when conveyor does not have a board. (SMEMA: board not available)
Note: The component providing 'contact closure' may be a relay or a transistor.
'Contacts open' will always be infinity but 'contacts closed' may not be 0 ohms.
In the case of a transistor it will be approximately 10K ohms and polarity of
pins 1 and 3 are positive. Wrong polarity while testing will give false readings.
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