Matrix Orbital VK202-25 Legacy - Manual (Page 32)

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.
6.1.12 Read module type (254 55)
This command will return a 1 byte hex value, over the RS-232 interface only, the model type value of
the module. Values for various modules at the time of this publication are as follows:
Table 15: Module Values
LCD0821 - 0x01 LCD2021 - 0x03 LCD2041 - 0x05
LCD4021 - 0x06 LCD4041 - 0x07 LK202-25 - 0x08
LK204-25 - 0x09 LK404-55 - 0x0A VFD2021 - 0x0B
VFD2041 - 0x0C LK162-12 - 0x34 VK202-25 - 0x0E
VK204-25 - 0x0F GLC12232 - 0x10 GLC24064 - 0x13
GLK24064-25 - 0x15 GLK12232-25 - 0x22 LK402-12 - 0x33
6.1.13 Set RS-232 port speed (254 57 [speed]) (R)
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 16: Speed Settings
Speed Value Speed
FF Hex 1200 baud
81 Hex 2400 baud
20 Hex 9600 baud
0F Hex 19200 baud
6.1.14 Set Serial Number (254 52 [byte1] [byte2])
Modules may be delivered with the serial number blank. In this case the user may set the desired 2 byte
serial number using this one time only command.
Upon the execution of this command, the module will echo these two bytes back over the RS-232 inter-
face. The serial number may be set only once. Any future attempt to execute this command will result in no
change and the module will return to the originally set serial number.
Matrix Orbital VK202-25 28