Torchmate CNC USB I/O Expansion Board Manual Download Page 10

 

Torchmate

 

CNC

                                               

I/O

 

Expansion

 

Board

 

Guide

                                                     

10

 

Spindle Feedback Control (“ENCODER” in Figure 4) 

This 8-Pin RJ-45 Connector is used for spindle encoder input, most commonly as spindle 
speed feedback to read the spindle speed in real time and to control threading operations on 
CNC lathes.  A CAT-5 cable connector (standard Ethernet drop cable) will plug into this 
receptacle.  For your convenience during the wiring process, you may choose to purchase an 
8-pin wiring block from Radio Shack (p/n 279-411) as described in the Analog Output 
section.  This device provides break-out screw terminals for all 8 pins and it can be obtained 
from www.radioshack.com.  

The spindle encoder inputs A, B and INDEX may be single-ended or differential and they 
may be connected to single channel or quadrature encoders.  The index pulse is not 
absolutely necessary, but it comes in handy if you have to re-start a thread already in 
progress or if you have a high-resolution encoder and a high spindle speed. 

The encoder signal requirements are as follows: 

1.

 

TTL Level Signals (0, 5V) for each channel 

2.

 

Single ended (A) or differential signals (A+ and A-) acceptable. 

3.

 

Single channel (A) or 2 channel (A+B Quadrature) acceptable. 

4.

 

Index pulse accepted, but not required 

5.

 

16 to 2048 CPR (contact Torchmate for support using encoders under 100 CPR) 

Table 4 shows the pin assignments for this connector and Figure 9 at right shows the pin 
orientation.   

Table 4: Spindle Feedback/Control 
               Connector Pin Functions 

 

 

 

 

 

 

 

RJ-45 

Pin No. 

 

Signal 

1 CH 

A- 

2 CH 

A+ 

3 CH 

B- 

4 CH 

B+ 

5 +5V 
6 INDEX+ 
7 GND 
8 INDEX- 

Figure 9: terminated CAT-5 cable and 

RJ-45 jack showing pin orientation. 

 
Figure 10 shows a plan view of the USB I/O Expansion Board with the external connectors 
highlighted.  Note that there are two RJ-45 connectors on the USB I/O Expansion Board that 
are used for two different purposes. 

 

Summary of Contents for USB I/O Expansion Board

Page 1: ...USB I O Expansion Board Manual 280 S Rock Blvd Suite 150 Reno Nevada 89502 Phone 775 673 2200 Fax 775 673 2206 Revised 11 02 2010 1998 2010...

Page 2: ...abilities 6 Rear Panel 6 External Connectors 6 Internal Connectors 11 Configuration Jumpers 14 JP70 Shield Ground 14 JP71 JP72 Input Power Select 14 Torchmate CNC Software Interface 15 Software Recogn...

Page 3: ...ts If you are upgrading an existing Signal Generator unit the USB I O Expansion board upgrade kit includes the following items shown in Figure 1 1 1 USB I O Expansion Board 2 3 7 8 Plastic Standoffs 3...

Page 4: ...panel of the signal generator Take note of the arrangement of the washers and nuts 6 Install the power jack assembly onto the new rear panel in the exact manner that it was installed on the old rear...

Page 5: ...e USB I O Expansion Board onto the main signal generator board Make sure that the male pins on headers JP30 and JP32 line up properly with the female receptacles on the bottom of the expansion board A...

Page 6: ...e connectors on the USB I O Expansion Board as shown in Figure 4 below Figure 4 USB I O Expansion Board Rear Panel External Connectors The USB I O Expansion Board provides four additional connectors t...

Page 7: ...voltage or closed switch The input lines are optically isolated Jumpers JP71 and JP72 select the power source for the input circuitry to be the internal power of the Signal Generator or isolated powe...

Page 8: ...d the associated pin assignments are presented in Table 2 Table 2 External Output Connector Pin Functions Mini Fit Jr Pin No Signal Mini Fit Jr Pin No Signal 1 OUTPUT 9 6 OUTPUT 10 2 OUTPUT 11 7 OUTPU...

Page 9: ...N and SPDIR pins when each is activated This external voltage can also be applied at TB71 For example Pin 5 can be supplied 24V in order to deliver 24V from SPON when Output 9 is activated in the Torc...

Page 10: ...t absolutely necessary but it comes in handy if you have to re start a thread already in progress or if you have a high resolution encoder and a high spindle speed The encoder signal requirements are...

Page 11: ...TB70 TB71 auxiliary power input ports JP20 JP21 JP22 50 pin headers The 50 pin headers are provided for ribbon cable expansion of almost all the signals that are available on the USB I O Expansion Bo...

Page 12: ...T GND IN 2 OPT GND OUT 2 GND 47 48 IN 9 OPT GND IN 1 OPT GND OUT 1 GND 49 50 OPT VCC OPT GND OPT VCC OPT GND 5V 24V GND JP30 JP32 USB I O Expansion Board Interface These two extended length connectors...

Page 13: ...embedded connection to auxiliary power supplies one for the isolated inputs TB70 and one for the 5V 24V supply that will bias the general purpose outputs plus SPON and SPDIR TB71 Figure 11 I O Expans...

Page 14: ...nsion Board This jumper should be left in its factory configured state unless otherwise directed by Torchmate technical support JP71 JP72 Input Power Select These two jumpers choose for the input bias...

Page 15: ...I O Expansion Board is installed Once the I O Expansion Board is recognized the software will enable the control of Input and Output lines 9 32 along with the Analog Output and Spindle Speed Feedback...

Page 16: ...ing the Analog Output Configuration screen Calibrating the Analog Output The locations of the GAIN and OFFSET potentiometers are shown in Figures 15 and 16 The adjustment procedure is described below...

Page 17: ...d and exposed wires on the other 4 Plug the RJ 45 connector into the DACOUT port on the back of the signal generator 5 In the Torchmate software select Configuration I O Analog Output Set the Output V...

Page 18: ...nks of 8 24V low side relay driver 250 mA each 8 each ACT logic TTL CMOS 5V 24mA each 2 each SPON SPDIR 24V push pull driver 250 mA each TB70 TB71 2 pin terminal blocks accept 16 26 AWG wire USB I O E...

Page 19: ...ansion Board Guide 19 Revision History Revision Date Description of Revision 1 22 07 Draft A 6 26 08 Updated B 9 25 08 Updated C 10 17 2008 Replaced added diagrams analog input internal conn s jumpers...

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