Black Box SC121A manual Selecting Internal Terminator Power, Selecting External Terminator Power

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CHAPTER 5: Configuration and Operation

5.3 Selecting Internal Terminator Power

On-board SCSI Switch terminators can be powered by internal 5-volt power or externally from SCSI-bus “terminator power” (TERMPWR).

Internal 5V

External

Terminator

Power

1

E13, E14, E19, E20

2or

E15, E16, E21, E22

3

Figure 5-4. Internal terminator-power jumpers.

Table 5-1. Jumper settings for internal termination.

SC120A-R2

SC121A

E14-Port A

E20-Port 1

E15-Port A

E21-Port 1

E13-Port B

E19-Port 2

E16-Port B

E22-Port 2

NOTE

The standard factory default connects internal terminators to internal

5volts.

5.4Selecting External Terminator Power

The SCSI Switch can supply external terminator power via an internal resettable fuse. This fuse supplies 1 amp at 5 volts to the terminator-power (TERMPWR) signal. The SCSI Switch contains internal protection and will not be affected if other SCSI devices provide terminator power.

E5, E6, E21, E22

or

E17–E20

Figure 5-5. External terminator-power jumpers.

NOTE

Factory default is “Enabled” on all ports.

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Contents 2 Scsi Matrix Switch European Union Declaration of Conformity 2 Scsi Matrix Switch NOM Statement Trademarks Used in this Manual Contents 2 Scsi Matrix Switch Single-Ended SE Scsi SC120A-R2 Only SpecificationsScsi Interface Differential DE Scsi SC121A OnlyLAN Port Low-Voltage Differential LVD Scsi SC120A-R2 OnlySerial Interface Agency ApprovalsPhysical Introduction About the Scsi SwitchFeatures Technical Description IntroductionGeneral Hardware Description SC121A block diagram Typical switch installation Power Equipment Off InstallationSwitch Placement What’s IncludedEthernet LAN Port Cabling Scsi Interface CablingRS-232 Serial Port Cabling LCD Display, Keypad, and Indicators Operator Controls and IndicatorsAC Power Switch LCD Display Control Menus Display Ports SET Temp Limit Scsi Switch Port Configuration Scsi Switch Default ConfigurationInternal Terminator Selection Configuration and OperationScsi Cable Interface Requirements Termination configuration SC120A-R2 termination example Selecting Internal Terminator Power Selecting External Terminator PowerSignal Description DB9 Pin DB25 Pin Serial-Port PinoutLAN/Serial-Port Commands Command Cmd Example Command String Response Expanded List of Commands Configuration and Operation Set Temperature Limit Ascii Character Reference for Scsi Switch Box Selection Graphical User Interface GUIConnecting Multiple Scsi Switches Typical ApplicationNetwork Control of Scsi Switch Apconcfg Utility Apconcmd Utility Scsi Technical Information Scsi BasicsScsi Installation Tips Scsi Technical InformationScsi Interface Signal Descriptions Signal Name Pin Number Scsi connector assignments for Scsi connector assignments for Differential 16-bit Scsi wide Low-voltage differential LVD 16-bit Scsi wide +BSY +ACK +RST +MSG Signal Name Pin Number HVD LVD Scsi Switch component placement Shipping and Packaging TroubleshootingCalling Black Box Legal Information Copyright 2002. Black Box Corporation. All rights reserved

SC121A, SC120A-R2 specifications

The Black Box SC120A-R2 and SC121A represent the cutting edge of industrial networking devices designed for robust performance and versatility in various environments. These devices are tailored for applications that require reliable data transmission, making them essential in modern automation and control systems.

One of the standout features of the Black Box SC120A-R2 and SC121A is their advanced serial-to-Ethernet conversion capability. This functionality allows users to connect legacy serial devices to Ethernet networks seamlessly. With support for multiple protocols, including TCP/IP and UDP, these converters ensure smooth communication between devices, regardless of their original architecture.

Both models are engineered to withstand harsh industrial conditions. They feature a rugged construction that includes high-quality enclosures designed for durability and protection against dust, moisture, and extreme temperatures. This resilience makes them ideal for use in factories, transportation, and other challenging environments.

In terms of connectivity, the SC120A-R2 and SC121A come equipped with multiple serial ports, enabling simultaneous connections to various devices. The auto-sensing capability of these ports simplifies installation and configuration, making them user-friendly for both technical and non-technical personnel. Users can easily manage and monitor connections through a straightforward web-based interface.

Additionally, these devices incorporate advanced security features, including encryption and authentication protocols, ensuring that data transmission remains secure from potential threats. This focus on security is crucial for industries where sensitive data is transmitted, enhancing overall system integrity.

The SC120A-R2 and SC121A also support a range of network configurations, allowing for flexibility in deployment. Their compatibility with various operating systems ensures that users can integrate them into existing systems without significant modifications.

Moreover, these models offer flexibility in power options, supporting both PoE (Power over Ethernet) and traditional power supply methods. This versatility enables easy installation without the need for additional power infrastructure.

Overall, the Black Box SC120A-R2 and SC121A are sophisticated networking devices that combine advanced technology with rugged design. Their ability to bridge the gap between legacy serial interfaces and modern Ethernet networks, coupled with robust features and security measures, makes them a valuable asset for numerous industrial applications. Whether in a manufacturing plant or a transportation hub, these devices provide reliable, efficient, and secure communication solutions that meet the demands of today's connected world.