Connecting an absolute SSI encoder to the TSX CCY 1128

Pinout configuration of the module’s 15-pin SUB D connector

The pinout configuration of the module’s 15-pin SUB D connector, for connection to an absolute SSI encoder, is as follows:

Pin No.	Signal	Designation
1	positive SSI data	Encoder input, positive SSI data (5VDC)
2	negative SSI data	Encoder input, negative SSI data
3	-	-
4	-	-
5	-	-
6	CLK +	Encoder output, positive SSI CLK (5VDC)
7	10…30 V	Encoder supply output (+ 10…30VDC)
8	0 V	Encoder supply output (- 0VDC)
9	-	-
10	-	-
11	-	-
12	-	-
13	EPSR	Positive encoder supply feedback input. Receives positive supply feedback from the encoder, which allows the module to verify the encoder’s presence.
14	CLK -	Encoder output, negative SSI CLK
15	5 V	Encoder supply output (+ 5VDC)

Diagram of the module’s SSI Data encoder input

The diagram below shows the SSI Data encoder input used with an absolute SSI encoder equipped with:

a high-level output with a line transmitter,
a 5VDC output voltage to the RS 422/RS 485 standard.

NOTE: the SSI Data input uses a differential line monitor.

Diagram of input A:

Diagram showing the process for connecting an absolute SSI encoder

The diagram below describes the process for connecting an absolute SSI encoder with a serial link, a 10…30VDC supply and outputs with standard RS 422 line transmitters.

Recommendations

Connect each DATA SSI+/SATA SSI- encoder signal using a twisted pair,
Connect each supply point using a twisted pair, in order to reduce the on-line voltage falls
Connect both terminals of the cable shielding to the protective ground.
If the encoder does not have a positive supply feedback output, connect the module’s EPSR input to the positive supply of the encoder.

CAUTION

ENCODER DAMAGE - PINOUT CONFIGURATION

Before connecting the encoder to the module, check the pinout configuration given by the encoder’s manufacturer.

Failure to follow these instructions can result in injury or equipment damage.