Matrix Orbital LK202-25 Legacy - Manual (Page 32)

6.1.13 Set I 2 C address (254 51 [address]) (R)
This command sets the I 2 C write address of the module. This value must be an even number and the
read address is one higher. For example if the I 2 C write address is set to 0x50, then the read address is 0x51.
The change in address is immediate. This address is 0x50 by default, and is reset temporarily back to that
value when the ’manual over-ride’ jumper is used on power up.
6.1.14 Read module type (254 55)
This command will return, over the RS-232 interface, the model type value of the module. Values for
various modules at the time of this publication are as follows;
Table 14: Module Types
LCD0821 - 0x01 LCD2021 - 0x03 LCD2041 - 0x05
LCD4021 - 0x06 LCD4041 - 0x07 LK202-25 - 0x08
LK204-25 - 0x09 LK404-55 - 0x0A VFD2021 - 0x0B
VFD2041 - 0x0C LK402-12 - 0x33 VK202-25 - 0x0E
VK204-25 - 0x0F GLC12232 - 0x10 GLC24064 - 0x13
GLK24064-25 - 0x15 GLK12232-25 - 0x22 LK162-12 - 0x34
6.1.15 Set RS-232 port speed (254 57 [speed])
This command sets the display’s RS-232 port to the specified [speed]. The change takes place immedi-
ately. [speed] is a single byte specifying the desired port speed. Valid speeds are shown in the table below.
The display can be manually reset to 19,200 baud in the event of an error during transmission (including
transmitting a value not listed below) by setting the ‘manual over-ride’ jumper on the display controller
board during power up. This command is ignored until this jumper is removed again.
Table 15: Speed Settings
Speed Value Speed
FF Hex 1200 baud
81 Hex 2400 baud
20 Hex 9600 baud
0F Hex 19200 baud
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