Dell Precision 620 User Manual Page 70
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Serial and Parallel Ports Overview
The two built-in serial ports use 9-pin D-subminiature connectors on the back panel. These ports support devices such as external modems,
printers, plotters, and mice that require serial data transmission (the transmission of data one bit at a time over one line).
Most software uses the term COM (for COMmunications) plus a number to designate a serial port. The default designations of your computer's
integrated serial ports are COM1 and COM2.
The integrated parallel port uses a 25-pin D-subminiature connector on the computer's back panel. This I/O port sends data in parallel format
(where eight data bits, or one byte, are sent simultaneously over eight separate lines in a single cable). The parallel port is used primarily for
printers.
Most software uses the term LPT (for Line Print Terminal) plus a number to designate a parallel port. The default designation of your computer's
built-in parallel port is LPT1.
Port designations are used, for example, in software installation procedures that include a step in which you identify the port to which your printer is
attached, thus telling your software where to send its output. An incorrect designation prevents the printer from printing or causes scrambled print.
Serial Port Connectors
If you reconfigure your hardware, you may need pin number and signal information for the serial port connectors. Figure 4 illustrates the pin
numbers for the serial port connectors, and Table 3 lists and defines the pin assignments and interface signals for the serial port connectors.
Figure 4. Pin Numbers for the Serial Port Connectors
Table 3. Pin Assignments for the Serial Port Connectors
Parallel Port Connector
If you reconfigure your hardware, you may need pin number and signal information for the parallel port connector. Figure 5 illustrates the pin
numbers for the parallel port connector, and Table 4 lists and defines the pin assignments and interface signals for the parallel port connector.
Figure 5. Pin Numbers for the Parallel Port Connector
Table 4. Pin Assignments for the Parallel Port Connector
Pin
Signal
I/O
Definition
1
DCD
I
Data carrier detect
2
SIN
I
Serial input
3
SOUT
O
Serial output
4
DTR
O
Data terminal ready
5
GND
N/A
Signal ground
6
DSR
I
Data set ready
7
RTS
O
Request to send
8
CTS
I
Clear to send
9
RI
I
Ring indicator
Shell
N/A
N/A
Chassis ground
Pin
Signal
I/O
Definition
1
STB#
I/O
Strobe
2
PD0
I/O
Printer data bit 0
- Notes, Notices, and Cautions 1
- Adjusting Volume 3
- Using Audio Utilities 4
- Installing Audio Drivers 4
- Backing Up Your Files 5
- Basic Checks 5
- Look and Listen 6
- System Setup 7
- Expansion Cards 9
- Adding Memory 11
- Microprocessor Upgrades 14
- SuprFreq Utility Program 16
- Replacing the System Battery 19
- International Dialing Codes 21
- Americas Contact Numbers 22
- Europe Contact Numbers 23
- Features 30
- Before You Start Testing 30
- Advanced Testing 31
- Connecting Drives 35
- Installing SCSI Devices 42
- Troubleshooting the Monitor 45
- Troubleshooting the Keyboard 45
- Troubleshooting the Mouse 45
- Troubleshooting I/O Ports 46
- Help Overview 48
- Contacting Dell 48
- System Board Labels 68
- I/O Ports and Connectors 69
- Interrupt Assignments 74
- Memory Allocations 75
- Technical Assistance 77
- Help Tools 77
- Problems With Your Order 78
- Product Information 78
- Before You Call 79
- Before You Begin 80
- Removing the Computer Cover 80
- Replacing the Computer Cover 81
- Inside Your Computer 83
- Troubleshooting the Battery 88
- Troubleshooting Drives 90
- System Features 92
- Front Panel 95
- Back Panel 96
- Getting Help 97
- System Messages 98
- System Beep Codes 102
- Warning Messages 103
- Diagnostics Messages 103
- Diagnostic LEDs 103
- SNMP Platform Event Traps 105
- User's Guide 106
- Configuring the NIC 107
- Reinstalling the NIC Driver 107
- Installing SCSI Drivers 110
- AC Power Recovery 111
- Asset Tag 111
- Auto Power On 111
- Boot Sequence 111
- CPU Information 112
- Integrated Devices 113
- Keyboard NumLock 114
- PCI IRQ Assignment 114
- Primary Video Controller 115
- System Time 118
- ZIP Floppy Support 118
- Overview 119
- Error Messages 119
- Input Errors 119
- Program Conflicts 120
- Memory Address Conflicts 120
- Microprocessor 121
- System Information 121
- Expansion Bus 121
- Ports and Connectors 122
- Graphics and Video 122
- Back to Contents Page 125
- Using System Setup 125
- System Setup Options 125
- Entering System Setup 126
- System Setup Screen 126
- System Setup Navigation Keys 127
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