
TMCM-078 Manual (V1.03 / September 10th, 2008)
8
Copyright © 2008, TRINAMIC Motion Control GmbH & Co. KG
Figure 3.3: Differential input circuit
3.1.5
I / O
Pin
Name
Function
Screw
JST
1
+3.3V
+3.3V
Co3.3V output, reference
2
REFA
REFA
Reference signal A (integrated 3.9 K pull up resistor to +3.3V)
3
REFB
REFB
Reference signal B (integrated 3.9 K pull up resistor to +3.3V)
4
GND
GND
GND
5
GPI
GPI
General Purpose Input
6
GPO
GPO
General Purpose Output
7
--
RS485A
RS485 remote control access A, TTL input
8
--
RS485B
RS485 remote control access B, TTL input
Table 3.5: I/O connector
3.2
Jumper
3.2.1
Select Optically Isolation
This jumper switches between two different kinds of step / direction interface circuits. If closed, the
opto isolated interface circuit will be selected (pluggable screw connectors). If open, the differential
input circuit can be used (JST connector). The opto isolated interface should be not used then.