User Manual

Command Summary 19
1.6 Turn
Software Flow
Control On
Dec
Hex
ASCII
254 58
FE 3A
■ :
Almost Full Almost Empty
Almost Full Almost Empty
Almost Full Almost Empty
v8.0
Enables simple flow control. The display will return a single, Xoff, byte to the host when the display buffer is
almost full and a different, Xon, byte when the buffer is almost empty. Full value should provide enough room for
the largest data packet to be received without buffer overflow. No data should be sent to the display between full
and empty responses to permit processing. Buffer size is 256* bytes. Not available in I
2
C. Default off.
Almost Full
Byte
Number of bytes remaining before buffer is completely full, 0 < Full < Empty < 256*.
Almost Empty
Byte
Number of bytes before buffer can be considered empty enough to accept data.
*Note: Buffer size was increased to 256 bytes from 128 bytes at firmware revision 8.3.
1.7 Turn
Software Flow
Control Off
Dec
Hex
ASCII
254 59
FE 3B
■ ;
v8.0
Disables flow control. Bytes sent to the display may be permitted to overflow the buffer resulting in data loss.
1.8 Set Software
Flow Control
Response
Dec
Hex
ASCII
254 60
FE 3C
■ <
Xon Xoff
Xon Xoff
Xon Xoff
v8.0
Sets the values returned for almost full and almost empty messages when in flow control mode. This command
permits the display to utilize standard flow control values of 0x11 and 0x13, note that defaults are 0xFF and 0xFE.
Xon
Byte
Value returned when display buffer is almost empty, permitting transmission to resume.
Xoff
Byte
Value returned when display buffer is almost full, signaling transmission to halt.
1.9 Echo
Dec
Hex
ASCII
254 255
FE FF
■
Length Data
Length Data
Length Data
v8.3
Send data to the display that it will echo. Useful to confirm communication or return information from scripts.
Length
Short
Length of data array to be echoed.
Data
Byte(s)
An arbitrary array of data that the module will return.
Response
Byte(s)
The same arbitrary array of data originally sent.
1.10 Delay
Dec
Hex
ASCII
254 251
FE FB
■ √
Time
Time
Time
v8.3
Pause command execution to and responses from the display for the specified length of time.
Time
Short
Length of delay in ms, maximum 2000.
1.11 Software
Reset
Dec
Hex
ASCII
254 253 77 79 117 110
FE FD 4D 4F 75 6E
■ ² M O u n
v8.4
Reset the display as if power had been cycled via a software command. No commands should be sent while the
unit is in the process of resetting; a response will be returned to indicate the unit has successfully been reset.
Response
Short
Successful reset response, 254 212.