Specifications

3-1
CHAPTER 3
INTERFACE
This chapter describes 4 types of the interface specifications which are required to connect the host device
with the printer.
Irrespective of the interface used, amount of the input buffer in the printer is 4k bytes, and transmission
buffer is 768 bytes. If the transmission buffer becomes the condition of the buffer full, the printer waits data
processing until the buffer can be received data. Be aware that printing process does not performed in that
meantime.
3.1 SERIAL INTERFACE SPECIFICATIONS (RS-232C CONFORMITY)
(1) General specifications
Item Specification
Synchronization Asynchronous
Signal level
MARK = –3.0 to –15.0 V: Logic '1'
SPACE= +3.0 to +15.0 V: Logic '0'
Baud rate 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps
Data bit length 7 bits or 8 bits
Stop bit length 1 bit or 2 bits
Parity None, odd or even
Reset Break signal input to RxD (20ms or longer)
(2) Pin assignment
Pin No. Name I/O Function
1 N.C. - No connection
2 TxD O Sends data from the printer to the host device.
3 RxD I
Receives data from the host device.
Break signal input (SPACE) resets the printer.
4 - - Internally connected with pin No.6.
5 GND - Signal ground
6 - - Internally connected with pin No.4.
7 CTS I Outputs SPACE when the host device can receive data.
8 RTS O Outputs SPACE when the printer can receive data.