8
4
Hardware
4.1
Standard Model
4.1.1
Extended Communication/Power Header
Figure 9: Extended Communication/Power Header
Table 2: Extended Communication/Power Pinout
Pin Function
6
RTS
5
CTS
4
Gnd
3
Tx (SDA)
2
Rx (SCL)
1
Vcc
The Extended Communication/Power Header provides a standard connector for interfacing to the
GTT480272A. Voltage is applied through pins one and four of the header. Please ensure the correct
voltage input for your display by referencing the electrical specifications in Table 11 before applying
power. Pins two and three are reserved for serial transmission using either RS-232/TTL levels, depending
on what has been selected by the Protocol Select Jumpers. Pins five and six are used for serial
transmission hardware flow control. Please note that unlike older Matrix Orbital displays, hardware flow
control is mandatory for serial communications in RS232 or TTL modes. The Serial Molex 22-04-1061
style header used can be mated to a number of connectors.
4.1.2
Alternate Serial Header
Advanced applications may prefer the straight two by five pin connection offered through the optional
Alternate Serial Header. The Alternate Serial Header may be added to the GTT480272A for an added
charge as part of a custom order. Please use the Contact section to reach Sales for additional details.
4.1.3
Protocol Select Jumpers
The Protocol Select Jumpers provide the means necessary to alter the standard GTT480272A
communication setting between RS-232 and TTL. As a default, the jumpers are set to RS-232 mode with
solder jumps on the RS232 jumpers. In order to change the display to TTL mode, simply remove the zero
ohm resistors from the RS232 jumpers and solder them to the TTL jumpers.
