Rev. 3.02
- 24 -
SRP-270
3-5-1(f) S/W Flow Control
When XON/XOFF flow control is selected, the printer transmits XON(ACSII 11h) or XOFF(ASCII 13h) signal
through the TXD line. If the Printer is BUSY, the Printer transmits XOFF(ASCII 13h) to host through the TXD
line. Then the host recognize that the Printer is BUSY. So, the host does not transmit a data to the Printer. If
the Printer is released from BUSY, the Printer transmits XON(ASCII 11h) to host through the TXD line. Then
the host recognize that the Printer is not BUSY. And the host transmit a data to the Printer.
※ Note : Refer to the Operation Manual about XON/XOFF flow control.
3-5-2 RS-485 Serial Interface
3-5-2(a) Specification
Item Description Remark
Data Transmission • Serial
Synchronization • Asynchronous
HandShaking
(Flow Control)
• H/W : DTR / CTS (Same as DSR)
• S/W : XON / XOFF
XON: ASC Code 11h
XOFF: ASC Code 13h
Signal Level
• Logic”1” : SD1-SD2 ≥ 0.2V, RD1-RD2 ≥ 0.2V
• Logic”0” : SD1-SD2 ≤ 0.2V, RD1-RD2 ≤ 0.2V
Baud Rate • 19200 / 2400 / 4800 / 9600 Bps
Data Word Length • 7 Bit / 8 Bit
Parity • None / Even / Odd
Connector • DB25P Female (I/F PBA)
Table 3-16 RS-485 Specification
※ Note : The HandShaking (Flow Control) / Data Word Length / Baud Rate / Parity functions depend
on the DIP Switch settings. Refer to the User’s Manual.
3-5-2(b) RS-232C I/F Cable
Same as the appearance of RS-232C Cable
3-5-2(c) Cable Connection
Figure 3-8 RS-485 Cable Connection
PRINTER
SIDE
HOST
SIDE
