1 DATECS
EP-50
26
27
User’s Manual
!
If the code table is selected using the DIP switches,
ESC t
command is
disabled and the code table cannot be changed by a command.
In the chinese version of the printer only
Sw8
is defined for changing the code
table:
Sw6
Sw7
Sw8
Code page
N/A
OFF
USA CP437
N/A
ON
Chinese GB2312
6. SERIAL INTERFACE CABLE ATTACHMENT
Turn off the printer before attaching the cable. After connecting the connectors
screw the two screws.
6.1 Serial Interface
6.2 Input-output Signals
R D
Serial input data signal
T D
Serial output data signal
D T R
Reception control signal
G N D
Ground
6.3 Signal Description
1
Start bit
One “Space” level bit. Indicates the beginning of data byte.
2
Data bits
Eight consequent bits. First is the least significant bit.
3
Stop bit
One “Mark” level bit. Indicates the end of the byte.
6.4 Dataflow Control
If a hardware protocol is selected the computer could send data only at “Space” level on
the
DTR
line. Data reception is disabled when the buffer is close to its upper limit.
Reception is re-enabled when the number of bytes in the buffer is below some limit.
If a software (XON/XOFF) protocol is selected the printer sends special control
characters – XON (11h) to enable and XOFF (13h) to disable transmission.
Baud rate
1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200 bps
Serial port parameters
1 start bit, 8 data bits, 1 stop bit, no parity
Signal characteristics
RS232C
Mark - logical 1 (-3V ää -12V)
Space - logical 0 (+3V ää +12V)
DTR control
RS232C
Mark - Data transfer disabled
Space - Data transfer enabled
!
