Pico Systems

Universal Stepper PWM Switch & Jumper Settings

Dip Switch

Switch	Function when Open
1	Digital Filter
2	Digital Filter
3	Unused
4	Unused
5	Unused
6	Unused
7	Unused
8	Unused
9	Unused
10	Address bit 5

Switch 10 selects bit 5 of the IEEE-1284 address that this board responds to. When closed, the board responds to addresses 0..31 (decimal) (or 00..1F hex), which is for the first board. When open, the board responds to addresses 32..63 (decimal) (or 20..3F hex), which would be treated by LinuxCNC as the second board. If you need more than two of these boards on the same parallel port bus, Jumpers JP2 and JP3 can be cut to control 2 more bits of addressing, allowing a total of 8 boards to operate together.

Digital Filter setting

Note: these settings only apply to Rev 5.x and later boards, earlier boards have the digital filter rate fixed at 1 MHz. This filter reduces the susceptibilty to noise on the encoder inputs.

DIP Sw 2	DIP Sw 1	Filter Rate
ON	ON	1 MHz
ON	OFF	2.5 MHz
OFF	ON	5 MHz
OFF	OFF	10 MHz

Jumpers

Jumper JP2, when cut, allows the board to respond to addresses with bit 6 high, in a manner similar to opening DIP switch 10.

Jumper JP3, when cut, allows the board to respond to addresses with bit 7 high, in a manner similar to opening DIP switch 10.

Jumper JP4 can be selected to enable or disable the watchdog timer on the board. When enabled, the watchdog will force the board into Emergency Stop mode when the rate generator registers have not been written to in 20 mS.

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