+/GPIO CONNECTOR 
This is a 37-pin D-Sub connector used for general purpose, digital 
Input/Output signals. A variety of commands are available to control 
these ports. See Section 3, Remote Mode and Appendix C for 
Connector Pin Outs. 
 
 
 
 
 
RS232-C
GPIO
Serial No. Label 
Power Entry 
Module 
Axis 3 Axis 2 Axis 1
Axis Connectors 
IEEE-488 (optional)
AUX Encoder 
Motor 
Interlock 
Figure 1.3: Rear Panel of the ESP300 (400 Watt chasse shown) 
AUXILIARY ENCODER 
This 25 pin D-Sub connector provides input for 3 auxiliary encoder 
channels (axis 4, 5, 6). For signal description, see Section C.1.4. 
These channels can be used for master-slaving (see Section 4.2), 
trackball and other applications. Additionally, 4 digital I/O pins are 
provided (See Section C.1.2). 
MOTOR INTERLOCK CONNECTOR 
The coaxial connector provides remote motor power interlock 
capability. One or more external switches can be wired to remotely 
inhibit the motor power in a way similar to the Stop All button on the 
front panel. 
The controller is shipped with a mating connector that provides the 
necessary wiring to enable proper operation without an external 
switch. 
RS232-C CONNECTOR 
The RS232-C interface to a host computer or terminal is made 
through this 9 pin D-Sub connector. The pin out enables the use of an 
off-the-shelf, pin-to-pin cable. 
IEEE-488 CONNECTOR 
1-10            Section 1 - Introduction