Quadrature Wiring

Use shielded twisted pairs for all connections to inputs and outputs. Route the quadrature encoder wiring separate from other wiring. You must provide the power supplies needed by your quadrature encoders.

CAUTION: If the drive outputs from the RMC are reversed, the axis will be uncontrollable when power is connected. Confirm that your wiring is correct!

DB25S Pin-out

Note: Color codes are for cable part number RMC-CB-QUAD-01. This cable has three wire groups: encoder, limits, and drive. The wire color column lists the wire group and the individual wire color within that group.
The encoder common should be connected to both wires listed.

Pin	Function	Wire Color	Pin	Function	Wire Color
1	A-	Enc: white/blue	14	Index (Z)-	Enc: white/green
2	A+	Enc: blue/white	15	Index (Z)+	Enc: green/white
3	B-	Enc: white/orange	16	Encoder Common	Enc: brown/white
4	B+	Enc: orange/white			Enc: white/brown
5	N/C		17	N/C
6	Retract Lim-	Lim: white/orange	18	Home-	Lim: white/green
7	Retract Lim+	Lim: orange/white	19	Home+	Lim: green/white
8	Extend Lim-	Lim: white/blue	20	Fault-	Drv: white/green
9	Extend Lim+	Lim: blue/white	21	Fault+	Drv: green/white
10	N/C		22	N/C
11	N/C		23	N/C
12	Drive*	Drv: blue/white	24	Enable*-	Drv: white/orange
13	Drive Common*	Drv: white/blue	25	Enable*+	Drv: orange/white

*Outputs, all others are inputs

Encoder Wiring

5 Volt differential driver:

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NPN Open Collector (NOT RECOMMENDED):

Note: Open collector encoders should only be used in lab environments with very little electrical noise and short wire runs.

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Noise immunity can be improved in the diagram above by adding a capacitor across each RMC encoder input: from +A to -A, from +B to -B, and from +Z to -Z. Notice the capacitors are connected to the minus inputs even though no signal wires are connected there. The capacitor will limit the frequency response of the input. Some suggested capacitor values are listed along with the resultant frequency response limit: