Matrix Orbital GLT240128 Legacy - Manual (Page 23)

Table 2: I 2 C Transaction Algorithm
START Toggle SDA high to low
Address 0x50
Information 0x48 0x45 0x4C 0x4C 0x4F
STOP Toggle SDA low to high
4.1.3 Serial Communication
In addition to being able to communicate via I 2 C the GLT24064 communicates natively through the
RS-232 protocol at at a default baud rate of 19,200 bps and is capable of standard baud rates from 9600
to 115,200 bps. Furthermore the GLT24064 is also capable of reproducing any non-standard baud rate in
between using values entered into our baud rate generation algorithm and set through command 164 (0xA4).
The display module communicates at standard voltage levels of -30V to +30V or at TTL levels of 0 to +5V
by setting the Protocol Select Jumpers to TTL.
4.1.4 USB Communication
The GLT24064 is a USB device that offers identical communication protocol as the serial comport.
capable of communicating via a USB interface. The USB communications are identical to the serial com-
munications. Communication is via a virtual com port, which is created in the operating system by the
drivers necessary to install the USB display. The GLT24064 communicating via USB is capable of baud
rates of 19,200 bps to 115,200 bps. Other baud rates are subject to the limitation of the virtual com port
driver. For further information regarding supported operating systems, and driver limitations please contact
technical support.
4.2 Turn Flow Control On
Syntax Hexadecimal 0xFE 0x3A [full] [empty]
Decimal 254 58 [full] [empty]
ASCII 254 “:” [full] [empty]
Parameters Parameter Length Description
full 1 Bytes remaining before issuing a
almost full message. (Full is 0)
empty 1 Bytes available before issuing a
almost empty message. (Empty is
128)
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