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GTT43A Hardware Manual 8

4.2 I

C Communication/Power Header

A dedicated I

C header is available on all GTT43A models and provides the most basic protocol

connection to the unit.

Figure 12: I

C Communication/Power Header

Table 7: I

C Communication/Power Pinout

Function

Vcc

SCL

SDA

Gnd

Voltage is applied through pins one and four of the header, please reference the electrical specifications

before applying power. Pins two and three are reserved for I

C clock and data signals respectively, both

of which should be pulled up to five volts using a resistance between one and ten kilohms. The Tyco

640456-4-LF style header used can be mated to a number of connectors, including Molex 22-01-3047.

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 13: RS422 Header

Table 8: RS422 Pinout

Function

Vcc

Tx (A)

Inv Tx (B)

*Inv Rx (Z)

*Rx (Y)

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.

*Note: Changes made in PCB Rev. 2.2, prior to Rev. 2.2 Pin 4 was Rx (Y) and Pin 5 was Inv Rx (Z).

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Matrix-orbital GTT43A Manual do Utilizador Página 12