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Documax 5380 User’s Manual
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RXD: The printer receives data
DTR: High level denotes that the printer is ready to receive the data from the HOST; contrarily,
denotes the printer is BUSY and it is forbidden to receive the data from the HOST.
TXD: The printer sends data
Data bit format:
Data bit is fixed 8 bits, Stop bit is fixed 1 bit.
Baud Rate
Serial communication baud rate can be set through menu setting:
1200 bps, 2400 bps, 4800bps, 9600bps, 19200 bps
Interface Protocol
The DTR from printer controls the data stream between printer and HOST. When DTR is high level, it
means the printer is READY, it can receive the data from HOST. DTR is high level in the following
conditions:
z
The printer is online
z
The data buffer area of the printer is larger than limited value.
z
The printer has no error
When the DTR is low level, it means the printer is BUSY, it can not receive the data from HOST. DTR is
low level in the following conditions:
z
The printer is offline
z
The data buffer area of the printer is smaller than limited value
z
The printer has error
X-ON/X-OFF Protocol
Send the X-ON (11H) code to the HOST from the printer through TXD, which indicates the printer is
FREE and can receive data from HOST. In the situation of the printer buffer area is larger than limited
value, the below two conditions can make the printer send X-ON code.
z
The printer becomes FREE from BUSY
z
The printer becomes ONLINE from OFFLINE
Send the X-OFF (13H) code to the HOST from the printer through TXD, which indicates the printer is
BUSY and can not receive data from HOST. In the following five conditions, printer sends X-OFF code
to printer:
z
The printer becomes BUSY from FREE
z
The printer becomes OFFLINE from ONLINE
z
The printer buffer area is smaller than limited value
z
The printer has error
z
The printer is paper out
Serial Specification
Serial data consists of Original bit (1 bit) + data bit (8 bits) + check bit (1 bit) + stop bit (1 bit). (As Figure
B-8 shown)
Figure B-8 Serial data format
Original bit D1 D2 D3 D4 D5 D6 D7 D8
Check bit
Stop bit
Data bit
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