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Serial Interface, Table 5-2., DB-9 Serial Connector Pinout

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Input/Output Interfaces 5.3 Serial Interface Systems covered in this guide may include one RS-232-C type serial interface to transmit and receive asynchronous serial data with external devices. Some systems may allow the installation of a second serial interface through an optional bracket/cable assembly that attaches to header P52 on the system board. The serial interface function is provided by the super I/O controller component that includes two NS16C550-compatible UARTs. The UART supports the standard baud rates up through 115200, and also special high speed rates of 239400 and 460800 baud. The baud rate of the UART is typically set to match the capability of the connected device. While most baud rates may be set at runtime, baud rates 230400 and 460800 must be set during the configuration phase. The serial interface uses a DB-9 connector as shown in the following figure with the pinout listed in Table 5-4. Figure 5-3. DB-9 Serial Interface Connector (male, as viewed from rear of chassis) Table 5-2. DB-9 Serial Connector Pinout Pin Signal 1 CD Description Carrier Detect Pin Signal 6 DSR Description Data Set Ready 2 RX Data 3 TX Data 4 DTR Receive Data Transmit Data Data Terminal Ready 7 RTS 8 CTS 9 RI Request To Send Clear To Send Ring Indicator 5 GND Ground -- -- -- The standard RS-232-C limitation of 50 feet (or less) of cable between the DTE (computer) and DCE (modem) should be followed to minimize transmission errors. Higher baud rates may require shorter cables. 5-4 www.hp.com Technical Reference Guide

Section	Page
Title	1
Table of Contents	3
Chapter 1: Introduction	7
1.1 About this Guide	7
1.2 Additional Informational Sources	8
1.4 Notation Conventions	8
1.3 Serial Number	8
1.5 Common Acronyms and Abbreviations	9
Chapter 2: System Overview	17
2.1 Introduction	17
2.2 Features	18
2.3 System Architecture	20
2.4 Specifications	26
Chapter 3: Processor/Memory Subsystem	29
3.1 Introduction	29
3.2 Intel Processors	30
3.3 Memory Subsystem	32
Chapter 4: System Support	35
4.1 Introduction	35
4.2 PCI Bus Overview	35
4.3 System Resources	41
4.4 Real-Time Clock and Configuration Memory	43
4.5 System Management	44
4.6 Register Map and Miscellaneous Functions	48
Chapter 5: Input/Output Interfaces	51
5.1 Introduction	51
5.2 SATA/eSATA Interfaces	52
5.3 Serial Interface	54
5.4 Parallel Interface Support	55
5.5 Keyboard/Pointing Device Interface	57
5.6 Universal Serial Bus Interface	59
5.7 Audio Subsystem	61
5.8 Network Interface Controller	64
Chapter 6: Integrated Graphics Controller	67
6.1 Introduction	67
6.2 Functional Description	68
6.3 Display Modes	70
6.4 Upgrading	71
6.5 Monitor Connectors	72
Chapter 7: Power and Signal Distribution	75
7.1 Introduction	75
7.2 USDT Power Distribution	75
7.3 SFF/CMT Power Distribution	76
7.4 Power Control	78
7.5 Power Management	80
7.6 Signal Distribution	82
Chapter 8: System BIOS	85
8.1 Introduction	85
8.2 ROM Flashing	86
8.3 Boot Functions	87
8.4 Client Management Functions	89
8.5 SMBIOS	91
8.6 USB Legacy Support	92
8.7 Management Engine Funcitons	92
Appendix A: Error Messages and Codes	93
A.1 Introduction	93
A.2 Beep/Power LED Codes	93
A.3 Power-On Self Test (POST) Messages	94
A.4 System Error Messages (1xx-xx)	97
A.5 Memory Error Messages (2xx-xx)	98
A.6 Keyboard Error Messages (30x-xx)	99
A.7 Printer Error Messages (4xx-xx)	100
A.8 Video (Graphics) Error Messages (5xx-xx)	100
A.9 Diskette Drive Error Messages (6xx-xx)	101
A.10 Serial Interface Error Messages (11xx-xx)	102
A.11 Modem Communications Error Messages (12xx-xx)	103
A.12 System Status Error Messages (16xx-xx)	104
A.13 Hard drive Error Messages (17xx-xx)	105
A.14 Hard Drive Error Messages (19xx-xx)	107
A.15 Video (Graphics) Error Messages (24xx-xx)	108
A.16 Audio Error Messages (3206-xx)	108
A.17 DVD/CD-ROM Error Messages (33xx-xx)	109
A.18 Network Interface Error Messages (60xx-xx)	109
A.19 SCSI Interface Error Messages (65xx-xx, 66xx-xx, 67xx-xx)	110
A.20 Pointing Device Interface Error Messages (8601-xx)	111

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5-4

www.hp.com

Technical Reference Guide

Input/Output Interfaces

5.3 Serial Interface

Systems covered in this guide may include one RS-232-C type serial interface to transmit and

receive asynchronous serial data with external devices. Some systems may allow the installation

of a second serial interface through an optional bracket/cable assembly that attaches to header

P52 on the system board. The serial interface function is provided by the super I/O controller

component that includes two NS16C550-compatible UARTs.

The UART supports the standard baud rates up through 115200, and also special high speed rates

of 239400 and 460800 baud. The baud rate of the UART is typically set to match the capability

of the connected device. While most baud rates may be set at runtime, baud rates 230400 and

460800 must be set during the configuration phase.

The serial interface uses a DB-9 connector as shown in the following figure with the pinout listed

in Table 5-4.

Figure 5-3.

DB-9 Serial Interface Connector (male, as viewed from rear of chassis)

The standard RS-232-C limitation of 50 feet (or less) of cable between the DTE (computer) and

DCE (modem) should be followed to minimize transmission errors. Higher baud rates may

require shorter cables.

Table 5-2.

DB-9 Serial Connector Pinout

Signal

Description

Signal

Description

Carrier Detect

DSR

Data Set Ready

RX Data

Receive Data

RTS

Request To Send

TX Data

Transmit Data

CTS

Clear To Send

DTR

Data Terminal Ready

Ring Indicator

GND

Ground