Текст страницы
DESCRIPTION
This communication protocol is based on Version 1.4, which was initially
released NOV 2005 and is used with all EVOLUTION products. The
communications option converses with a host computer via an RS485 data link.
NOTE: EACH REQUEST OR COMMAND SENT TO A PRINT STATION
RECEIVES A RESPONSE FROM THAT PRINT STATION. COMMUNICATIONS
SOFTWARE MUST WAIT FOR A RESPONSE TO DETERMINE IF THE PRINT
STATION WAS READY TO ACCEPT THE COMMAND, AND THE DATA WAS
VALID AND PROCESSED. NO RESPONSE COULD INDICATE THE DATA
WAS LOST. IF AN ERROR WAS DETECTED IN PROCESSING A NAK WITH
AN ERROR CODE IS RETURNED.
DATA WORD DEFINITION
Full Duplex
7 Data Bits
1 Even Parity Bit
1 Start Bit
1 Stop Bit
BAUD RATE
115,200 Bits per second
DEFINITIONS
Q=QUERY TO HEAD
R=RESPONSE FROM HEAD
D=DATA UPDATE TO HEAD
X=ACK FROM HEAD
‘!’=ASCII CHARACTER OR CHARACTERS
0x21 HEX DATA EQUIVELENT
ADDRESS= TWO ASCII REPRESENTATIONS OF HEX CHARACTERS
`x`|`y` TWO ASCII CHARACTERS REPRESENTING THE UPPER AND
LOWER
NIBBLE OF A HEXADECIMAL BYTE WHERE X IS THE UPPER
NIBBLE AND
Y IS THE LOWER NIBBLE
FOR EXAMPLE:
TO SEND A SPEED OF 105 FEET PER MINUTE SEND
ASCII : (0x3a) AND ASCII 5 (0x35)
TO SEND A DELAY OF 30 SEND
ASCII 3 (0x33) AND ASCII 0 (0x30)
NOTE: THE ` CHARACTER AND | CHARACTER ARE NOT PART OF THE DATA STREAM
AND ARE THERE FOR SEPARATION OF FIELDS ONLY.
6
EVOLUTION LX SYSTEM MANUAL Issue 1.0 5 DEC 2009