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14-1. RS-232C Interface Specifications
14. RS-232C Interface
(1) Data transmission method: Asynchronous start-stop
(2) Baud rate:
4800, 9600, 19200, 38400 bps (selectable with DIP switch)
(3) Data:
1 start bit
7 or 8 data bits (selectable with DIP switch)
Odd, even, or no parity (selectable with DIP switch)
1 stop bit
(4) Signal polarity:
RS-232C
Mark: Logic “1” (-3 V to -15 V)
Space: Logic “0” (+3 V to +15 V)
14-2. Connector and Signal Name
Pin number Signal name
Direction
Function
FG
−
Frame ground
TXD
OUT
Transmission data
RXD
IN
Receive data
RTS
OUT
Same control as DTR
N.C
−
Not used
DSR
IN
(1) STAR line mode
Not used
(2) ESC/POS mode
1) DIP SW3-7 = OFF
a) DTR/DSR mode
Indicates whether the host can receive data.
(This excludes data transmission that uses <DLE> <EOT> and <GS a> commands.)
SPACE: The host can receive data.
MARK: The host cannot receive data.
b) X-ON/X-OFF mode
Status of this signal is not checked.
2) DIP SW3-7 = ON
Functions as an external reset signal.
A mark signal with a pulse width of 1 ms or longer resets the printer.
A
B
C
D
b0
b1
b2
b3
b4
b5
b6 (b7)
MARK “1”
SPACE “0”
A: Start bit
B: Data bit
C: Parity bit
D: Stop bit
