Scsi Channels And Channel Numbering; Serial Ports; Table 1-2 Scsi Channel Numbers And Characteristics - Silicon Graphics Origin200 Owner's Manual

Chapter 1: Overview of the Origin200 System

Serial Ports

18

SCSI Channels and Channel Numbering

There are two SCSI channels in each Origin200 module. Table 1-2 lists the channels in
each module and their characteristics.
Table 1-2 SCSI Channel Numbers and Characteristics
First Second Drives
Module Module
0 2 3.5-inch
1 3 5.25-inch Fast SCSI-II, 8-bit (narrow), running at 10 MHz, and capable of
SCSI channels in a one-module system are fixed at 0 and 1. The master module in
Note:
a two-module server also uses channels 0 and 1. However, the slave module channel
numbers may vary depending upon the order in which they are detected the first time
the system is powered on. Table 1-2 shows typical channel numbers for a second module
in a two-module system. See "Determining the Devices Installed on Your Server" in
Chapter 4 for an explanation of device detection and numbering.
Each Origin200 module provides two serial ports capable of transferring data at speeds
ranging from 50 baud to 460 Kbaud in RS-232 mode. The default serial port configuration
is RS-232, but the serial ports can be opened programmatically in RS-422 mode.
The serial port connectors are DB9, male, and are designed to be IBM-compatible.
Because of this, they do not use the same pinouts as prior Silicon Graphics DB9 serial
ports. See Appendix A, "Connector Pinout Assignments" for a description of the serial
port pin assignments.
Description
Fast-20 SCSI-II, 16-bit (wide), running at 20 MHz, and capable
of transferring 40 MB per second
transferring 10 MB per second