When data is received by the computer from the 8SC, each pin that is connected to ground will return a unique number. Example:
When no inputs are tied to ground, RN2 pulls all inputs high. This returns a 255.
When input 1 is the only line connected to ground, a 254 will be returned
Input 1 is weighted by 1.
Input 2 is weighted by 2.
Input 3 is weighted by 4. |
| See the included program "8SCTESTB.BAS" for an example |
Input 4 is weighted by 8. |
| of how to software decode the incoming number to the original |
Input 5 is weighted by 16. |
| lines that were turned on or off. Also, many programs have |
Input 6 is weighted by 32. |
| been included to decode the 8SC inputs to several desirable |
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| output types. The method shown is the default method. | |
Input 7 is weighted by 64. |
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Input 8 is weighted by 128. |
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Input1 Input2 Input3 Input4 Input5 Input6 Input7 Input8 Ground |
| (on) and can be turned off by connecting a wire to the ground line. |
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| When resistor network RN2 is installed, all inputs are pulled high |
To Power Supply Ground
To V+ (9 to 12 Volts)
To
To
To
J5 - Baud Rate Select. In- | J6 - Reserved for future expansion. | |
fine the device number of the 8SC, allow- | stall this jumper for 1200 | Jumper between the left two posts. |
ing 16 devices to coexist on a single serial | baud operation; remove for |
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line. See | 9600 baud operation. |
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Make sure you NEVER connect the power supply to this device backwards. Doing so will destroy the 78L05 and possibly the PIC. Remember, minimal operation voltage is around 7 volts. Also, verify part orientation before proceeding. Watch for shorted solder connec- tions. Please verify component placement before you continue.
