Sun-microsystems Interface Adapter Uživatelský manuál Strana 39
- Strana / 66
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
Chapter 4 SunHSI Utilities 19
HDLC Mode
The default operating mode used by the SunHSI software is the HDLC full-duplex
protocol (mode=fdx). In this mode the transmitter is always enabled. The
transmitter sends flag bytes continuously when it is not sending a data frame.
If no message is currently being transmitted, the driver will attempt to start sending
its next message. At this point the driver indicates that it is busy transmitting, to
prevent the transmission of another message concurrently. The driver also activates
a mechanism that ensures that the transmit operation will not hang if the hardware
is not responding.
When the transmission is completed, the busy mechanism previously set is cleared
and the next message can be transmitted. If the transmission is hung an abort
sequence is sent instead of the cyclic redundancy check (CRC), so that the receiver
will not interpret the frame as valid data. The message is discarded, and the output
error statistic is incremented, which allows for a proper recovery by higher level
protocols.
The received data is buffered until a complete frame has been received. If any error
occurs during the reception of a frame, the appropriate statistic is incremented and
the frame is discarded.
IBM (SDLC) Mode
SDLC mode is designed to support IBM system network architecture (SNA)
communications. It uses most of the same protocols used in HDLC mode, with two
major exceptions:
■ When the line is idle, instead of sending flag bytes the transmitter is disabled.
■ The request-to-send (RTS) and clear-to-send (CTS) signals are used to gate
transmission.
IBM Full-Duplex Mode
When the SunHSI software is set to this mode (mode=ibm-fdx), the software uses a
full-duplex point-to-point communication protocol. Both ends of the link are
expected to have RTS and CTS signals asserted at all times when data is being
exchanged. When starting a message transmission, the interface raises the RTS signal
and expects the CTS signal to be asserted immediately. If this is not done, all
messages currently queued for transmission are discarded, and the write operation
returns an error.
- Sun™ PCI High Speed Quad Port 1
- Serial Interface Adapter 1
- User’s Guide 1
- Contents 3
- ▼ To Test the Installation 14 4
- Contents v 5
- FCC Class A Notice 11
- FCC Class B Notice 11
- BSMI Class A Notice 12
- CCC Class A Notice 13
- GOST-R Certification Mark 13
- Declaration of Conformity 15
- How This Book Is Organized 17
- Using UNIX Commands 18
- Shell Prompts 18
- Typographic Conventions 19
- Related Documentation 19
- Third-Party Web Sites 20
- Sun Welcomes Your Comments 20
- Product Overview 21
- Features 22
- Software Requirements 23
- SunHSI/U Adapter Installation 25
- External Cabling 26
- RS-232 to RS-449 Connections 27
- Installation Overview 29
- Requirements 31
- Installing the Software 32
- Configuring the Software 34
- SunHSI Utilities 37
- T1 Compatibility Options 38
- Operating Modes Options 38
- HDLC Mode 39
- IBM (SDLC) Mode 39
- IBM Half-Duplex Mode 40
- IBM MultiPoint Mode 40
- Chapter 4 SunHSI Utilities 21 41
- Pin Assignments 43
- Interface Signals 47
- Null Modem Cable Requirements 49
- Clocking 50
- Building the Null Modem Cable 50
- RS-449 Null Modem Cable 51
- X.21 to RS-449 Converter 54
- Data Signal Inversion 55
- HDLC Zero Insertion Algorithm 56
- Clock Signal Inversion 57
- SunVTS Diagnostic Testing 59
- Viewing the Man Pages 61
- Environments 62
- Glossary 63
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