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7.2.4.2 Serial interface (DB-25)
DB-25 serial interface connector’s pin number is shown as Figure 7-7:
Data input/output mode: 7-bit or 8-bit serial interface
Data input code: ASCII, JIS 7-bit or 8-bit, International character code, CG, Dot matrix graphic code
based on graphic symbol code (8-bit)
Data buffer: 132K bytes most
Signal level: RS-232C: ±12V
Data transit speed (baud rate) RS-232C: 1200bps, 2400bps, 4800bps, 9600bps, 19200bps
Data transmission protocol RS-232C: READY/BUSY (DTR) or X-ON/X-OFF
Synchronous system: Original bit: 1 bit Stop bit: 1~2 bit
Character length: 7 ~ 8 bits
Connector Pin Assignments
RS-232C default settings
PIN ABBREVIATION NAME DIRECTION RDY/BSY X-ON/X-OFF
1 FG Frame Ground —— O O
2 SD Transmitted Data OUT X O
3 RD Received Data IN O O
4 RTS Request to Send OUT * *
7 SG Signal Ground —— O O
20 DTR Data Terminal Ready OUT O O
O: USE X: NOT USE *: HIGH LEVEL
Signal description:
Prescription of signal level on RS-232C
1=Low (Mark): -25 ~ -3 V
0=High (Space): +3 ~ +25V
RDY/BSY protocol (RS-232C)
PIN 1 FG (Frame Ground — connect to the printer rack
Stop bit
Data bit
Original bit Parity check bit
Figure 7-8 Serial data format
Figure 7-7 DB-25 serial interface connector pin number
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