Matrix Orbital LCD/VFD Legacy - Manual (Page 21)

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.
5.1.9 Read module type (254 55)
This command will return, over the RS-232 interface, the model type value of the module. This command
will return a 1-byte hex value. Values for various modules at the time of this publication are as follows;
Table 10: 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 VFD4021 - 0x0D VK202-25 - 0x0E
VK204-25 - 0x0F GLC12232 - 0x10 GLC24064 - 0x13
GLK24064-25 - 0x15 GLK12232-25 - 0x22 LK404-AT - 0x31
LK402-12 - 0x33 LK162-12- 0x34 LK204-25PC - 0x35
5.1.10 Set RS-232 port speed (254 57 [speed])
This command sets the RS-232 port to the specified [speed]. The change takes place immediately.
[speed] is a single byte specifying the desired port speed. Valid speeds are shown in the table below. The
speed can be manually reset to 19,200 baud in the event of an error during transmission (including transmit-
ting a value not listed below) by setting the ’manual over-ride’ jumper on the module during power up. This
command is ignored until this jumper is removed again.
Table 11: Speed Settings
Speed Value Speed
FF Hex 1200 Baud
81 Hex 2400 Baud
20 Hex 9600 Baud
0F Hex 19 200 Baud
5.1.11 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
Matrix Orbital LCD4041 18