PPMC Universal Stepper Board home and limit switches

Connectors :

P1 connects to the PC parallel port.

P3 and J3 connect to the encoders, if present. You can choose the IDC punch-down connectors of P3 or the ribbon-cable header of J3. + 5 V Power and ground are only available on the J3 connector. If using P3, then encoder power and ground can be obtained from P2. For each axis, the encoder signals are A, B and Z, if used. Pins are as follows :

P3 Pin #	J3 Pin #	Board Marking	Signal
1	1	A0	Axis 0 A
2	2	B0	Axis 0 B
3	3	Z0	Axis 0 Z (index)
4	4	A1	Axis 1 A
5	5	B1	Axis 1 B
6	6	Z1	Axis 1 Z (index)
7	7	A2	Axis 2 A
8	8	B2	Axis 2 B
9	9	Z2	Axis 2 Z (index)
10	10	A3	Axis 3 A
11	11	B3	Axis 3 B
12	12	Z3	Axis 3 Z (index)
	13		Ground
	14		+ 5 V Power

A and B are the quadrature signals from the encoder. If you have an encoder with an index channel, this is connected to the Z input. If no encoder, connect S0 to Z0, S1 to Z1, etc. If you have an encoder without the index channel, connect A to Z for each axis.

P2 connects to the stepper drivers, and also provides unregulated power to the board, and regulated +5 V can be taken from the board to supply encoders. J2 does not provide the unregulated power to the board, otherwise all the other signals are available. Pins are as follows :

P2 Pin #	J2 Pin #	Board Marking	Signal
1	1	S0	Step to Axis 0
2	2	D0	Direction to Axis 0
3	3	S1	Step to Axis 1
4	4	D1	Direction to Axis 1
5	5	S2	Step to Axis 2
6	6	D2	Direction to Axis 2
7	7	S3	Step to Axis 3
8	8	D3	Direction to Axis 3
9	13	G	power ground (same as P2-11)
10	14	+5	+5 Volt output
11		G	power ground
12		PWR	Unregulated power in

P4 and P5 connect to the digital input contact closures, and also provide isolated +5 V power for these switches. J4 brings out the same connections in ribbon cable header form. P5-7 and P5-8 are a source of isolated 5 V power from an on-board DC-DC converter, to be used for the digital inputs. For each input, a switch is connected between that input and P5-7. P4 Pins are as follows :

P4 Pin #	J4 Pin #	Board Marking	Signal	Function
1	1	0	Bit 0 input	X Home
2	2	1	Bit 1 input	-X Limit
3	3	2	Bit 2 input	+X Limit
4	4	3	Bit 3 input	available
5	5	4	Bit 4 input	Y Home
6	6	5	Bit 5 input	-Y Limit
7	7	6	Bit 6 input	+Y Limit
8	8	7	Bit 7 input	available
9	9	8	Bit 8 input	Z Home
10	10	9	Bit 9 input	-Z Limit
11	11	10	Bit 10 input	+Z Limit
12	12	11	Bit 11 input	available

P5 Pins are as follows :

P5 Pin #	J4 Pin #	Board Marking	Signal	Function
1	13	12	Bit 12 input	available
2	14	13	Bit 13 input	available
3	15	14	Bit 14 input	available
4	16	15	Bit 15 input	closed for E-Stop OK
5	17	FS	(Not Used)
6	18	FC	(Not Used)
7	19	EG	Isolated Ground	other end of switches
8	20	E+5	Isolated +5 Source

P6 and P7 bring out the Solid State Relay terminals. Each output is separately fused, and isolated. P6 Pins are as follows :

Pin #	Signal
1	SSR 1 source
2	SSR 1 load
3	SSR 2 source
4	SSR 2 load
5	SSR 3 source
6	SSR 3 load
7	SSR 4 source
8	SSR 4 load

P7 Pins are as follows :

Pin #	Signal
1	SSR 5 source
2	SSR 5 load
3	SSR 6 source
4	SSR 6 load
5	SSR 7 source
6	SSR 7 load
7	SSR 8 source
8	SSR 8 load

P8 has 8 outputs that can be used to drive a Digital to Analog Converter for spindle speed control, for example, or as 8 separate logic outputs. These outputs are not isolated or protected in any way, and so should be connected only to logic devices. Note that pins 11 and 12 are only wired to SSR #1 and #2 on boards of Rev 2.3 and later. P8 Pins are as follows :

Pin #	Signal
1..8	Least significant bit .. Most significant bit
9	Ground
10	+ 5 V
11	Not-Reverse
12	Not-Forward

Board Layout

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