Microcom 428LT Operator's Manual page 72

Chapter 5
The host sends a command byte to the Ethernet port every few milliseconds.
The printer's Ethernet interface will pass the command byte on to the printer
only when there is a change, i.e., when there is a new command.
The printer sends a byte of status data to its Ethernet interface using the same
data format, and will only send the data when there is a change in status. The
printer's Ethernet interface will send the printer status byte to the HOST every
few milliseconds.
This is the command byte configuration:
Command Byte From Host to Printer:
Bit #
0
1
2
3
4
5
6
7
The HOST only sends the command byte to the printer. The printer's Ethernet
interface receives this command byte from the HOST and tests it to see if it is
different from the previous command byte. If there is a change, then the
command byte is put into the "xx" of a ^Axx^D110 command and sent to the
printer. Valid values for "xx" are determined from the "Host to Printer" table
above.
The printer sends a status byte to the host every few milliseconds thru its
Ethernet interface. This status byte is sent whether there is a change of status
or not.
Bit #
0 (LSB)
1
2
3
4
5
6
7 (MSB)
The General Purpose Status byte mode of operation is enabled by Soft Switch
#5, Bit #8. These are the specific commands:
428LT Operator's Manual - 880040-0200
Function when = "1"
PRINT
PRINT TEST PATTERN
RESET
not used
not used
not used
not used
not used
Status Byte From Printer to Host:
Function when = "1"
IN RESET or PRINTING
ERROR
DOWNLOADING A FORMAT
FORMAT LOADED
not used
not used
not used
not used
Printer Commands
Function when = "0"
DON'T PRINT
DON'T PRINT TEST PATTERN
DON'T RESET
Function when = "0"
NOT BUSY
NO ERROR
FINISHED DOWNLOAD
NO FORMAT LOADED
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