Technical data
Table Of Contents
- Introduction
- Set Initial Conditions (SIC) Command
- IBM Emulation Mode Printer Commands
- Control Codes
- Escape Sequences
- Printer Command Parameters
- Command Structure
- Printer Command Quick Reference (IBM Emulation Mode)
- Selecting a Character Set
- Select Code Page
- Print From Code Page
- Download a Character Set
- Select Global Font
- Select Print Type Style
- Set Print Quality
- Graphics Print Modes
- Horizontal Movement
- Line Control
- Vertical Tabulation
- Line Spacing
- Set Top of Form and Page Length
- Printer Control
- Epson Emulation Mode Printer Commands
- OKI Microline Emulation Mode Printer Commands
- Using the Printer Interface
- Downloading Characters and Fonts
- Barcodes
- Code Pages
- Glossary
- Index
Section 6: Using the Printer Interface
102
The following diagram illustrates DTR Protocol Timing.
Legend:
1 The RTS signal is driven directly by the RS-232C line driver and is active
any time power is supplied to the printer.
2 The DTR signal becomes active (high) when initialization is complete,
telling the computer that the printer is ready to receive data.
3 DTR drops (low) to tell the computer that the printer buffer is full or the
printer is busy and data transmission should stop. If the computer con-
tinues to send data after the printer lowers the DTR signal, data could be
lost. DTR is raised (high) when the printer is again ready to receive data.
XON/XOFF Protocol Timing
When you select this flow control protocol, the printer sends an XOFF
command to the host to indicate that the printer cannot receive more data
because it has one of the following conditions:
• Buffer full
• Attendance error (paper out, printer error)
• Printer is not in ready state
The following diagram illustrates XON/XOFF Protocol Timing.
Legend:
1 Data received when DSR is low is invalid and discarded.