Matrix Orbital GTT70A - Manual (Page 12)

GTT70A Hardware Manual 8
4.2 Alternate Power Connector
The Alternate Power Connector provides the ability to power the GTT70A using a second cable. This
connection is required for USB protocol due to the power requirements of the GTT70A.
Figure 13: Alternate Power Connector
Table 8: Alternate Power Pinout
Pin Function
1 5V
2 Gnd
3 Gnd
4 NC *
The standard Tyco 171825-4 style header is particularly useful for connecting to an unmodified floppy
power cable, a 171822-4 for example, from a PC power supply for a simple bench power solution.
*Note: When using a –VPT model, it may be desirable to input power to the GTT using the floppy power cable 12V
connection. Please Contact a friendly Matrix Orbital support representative for modification details.
4.3 RS422 Header
RS422 communication provides an industrial alternative to the standard RS232 communication protocol.
Rather than single receive and transmit lines, the RS422 model uses a differential pair for each receive
and transmit signals to reduce degradation and increase transmission lengths.
Figure 14: RS422 Header
Table 9: RS422 Pinout
Pin Function
1 Vcc
2 Tx (A)
3 Inv Tx (B)
4 Inv Rx (Z)
5 Rx (Y)
6 Gnd
The six pin RS422 Header offers a power and ground connections at either end, and two differential pair
communication lines in the middle. Regular and inverted lines, labelled A/B and Z/Y, are provided for
receive and transmit signals. The standard Tyco 282834-6 style header populated is best mated to a
sized 16 to 30 on the American Wire Gauge connections that are secured via the header screws.