Epson STYLUS 870 Programming Manual page 57

* The remaining four least significant bits are the parameter embedded in the command byte
(unsigned).
If the parameter has a value of from 0 to 15, it can be embedded in the command byte.
When the parameter extension bit is 1, parameter bytes follow up to a maximum of 15 bytes.
Second group (parameters not embedded type) command format
7 6 5 4 3 2 1 0
1 1 1 0
7 6 5 4 3 2 1 0
1 1 1 1
* If the three most significant bits of the command byte are all 1, this indicates the second
group.
* The command type is indicated by the four least significant bits:
<CLR>:
<CR>:
<EXIT>:
<MOVXBYTE>:
<MOVXDOT>:
* The fourth bit is the bit for future parameter extension. When this bit is 0, this means that
there are no parameters, while when this bit is 1, this means that there is one subsequent
parameter byte. Further, the MSB of the parameter byte is always the parameter
extension bit, and when this bit is 0 this means that the parameter terminates with this
byte, while when this bit is 1, this means that there is one subsequent parameter byte. By
the parameter extension bit operating in this manner, it is possible to extend the
parameters indefinitely.
Initial State: -
Related Commands:
Commands related in the direction of applying an effect (Setting)
None
Commands related in the direction of receiving an effect (Setting)
None
Commands related in the direction of applying an effect (Operation)
None
Commands related in the direction of receiving an effect (Operation)
None
EPSON Imaging Technology Center
Revision: 1
Command bit
Parameter extension bit
7 6 5 4 3 2 1 0
0
MSB LSB
Parameter extension bit
Command bit
11100001B
11100010B
11100011B
11100100B
11100101B
Parameter bit
Page: 57
10/6/00