6-6
Chapter 6: Communication Interface
[DTR SPACE] - When ready to accept data.
- Remaining space in the 4K buffer rises above 512 bytes. **
[XON sent]
- When ready to accept data after power on.
- Remaining space in the 4K buffer rises above 512 bytes. **
[XOFF sent] - In an error state.
- Remaining space in the 4K buffer falls below 256 bytes*
* - 10 bytes in line mode.
** - 20 bytes in line mode.
Sending data (status):
In DTR/DSR mode, data is sent only when DSR is SPACE.
In XON/XOFF mode, DSR state is ignored.
XON/XOFF Protocol
The XON/XOFF characters coordinate the information transfer
between the printer and the host computer. The printer sends an XON
character when it is ready to receive data and it sends an XOFF
character when it cannot accept any more data. The software on the
host computer must monitor the communication link as shown in the
following flowchart in order to send data at the appropriate times.
If XON/XOFF has been selected, the printer also toggles the DTR
signal, as described in the next section, but it does not look at the DSR
signal to transmit data.
Host Flow Control Diagram
Summary of Contents for 7158
Page 1: ...NCR 7158 Thermal Receipt and Impact Printer Release 1 0 Owner s Guide B005 0000 1112 Issue D...
Page 26: ...1 8 Chapter 1 About the Printer...
Page 50: ...3 12 Chapter 3 Using the Printer Clearing Check Flip Paper Jams Check Check Flip Window Door...
Page 110: ...5 28 Chapter 5 Technical Specifications Code Page 437...
Page 111: ...Chapter 5 Technical Specifications 5 29 Code Page 850...
Page 112: ...5 30 Chapter 5 Technical Specifications Code Page 852...
Page 113: ...Chapter 5 Technical Specifications 5 31 Code Page 858...
Page 114: ...5 32 Chapter 5 Technical Specifications Code Page 860...
Page 115: ...Chapter 5 Technical Specifications 5 33 Code Page 863...
Page 116: ...5 34 Chapter 5 Technical Specifications Code Page 865...
Page 117: ...Chapter 5 Technical Specifications 5 35 Code Page 866...
Page 128: ...6 10 Chapter 6 Communication Interface...
Page 286: ...7 158 Chapter 7 Programming Guide...
Page 314: ...Index 8 W Weight of printer 5 36 X XON XOFF protocol 6 6...