Scale indicators must meet at least the following requirements. Return to Top
Serial output - capability of transmitting data out a serial port.
Continuous send - serial data is constantly transmitted by the scale.
Minimum of two readings per second - at least two full packets of data out it's serial port every second. This is sometimes refered to as Sample Rate or Refresh Rate.
Common connectors look like this: Return to Top
 DB25 Male
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 DB25 Female
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 DB9 Male
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Connections DB25 to DB25 Return to Top
Connections should be made as follows:
DB25 Male
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DB25 Female
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DB-25 DTE to
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DB-25 DTE
-3 RXD
-2 TXD
-7 GND |
Connections DB25 to DB9 Return to Top
Connections should be made as follows:
DB25 Male
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DB9 Male
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DB-25 DTE to
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DB-9 DCE
-2 RXD
-3 TXD
-5 GND |
Some indicators have to be hard wired. This means that the wires must be connected inside the indicator either by screw terminal or solder. In this case, the following applies:
Hardwire Connections DB25 to scale should be made as follows: Return to Top
DB-25 DTE to Scale
TXD 2--RXD
RXD 3--TXD
GND 7--GND
Hardwire Connections DB9 to scale should be made as follows: Return to Top
DB-9 DCE to Scale
TXD 3--RXD
RXD 2--TXD
GND 5--GND
For more information on wiring consult the manual for the scale indicator.
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