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RUGGEDCOM ROS
User Guide
Reading the ErrorAlarm Status From a Device Using TruthValue
To understand how to use the TruthValue format to read the ErrorAlarm status from a device, conside a ModBus
request to read mulitple registers from location 0x0045.
0x04
The response may look like:
0x04
The register's lower byte shows the ErrorAlarm status. In this example, there is no active ERROR, ALERT or CRITICAL
alarm in the device.
Section 1.8
SSH and SSL Keys and Certificates
The following describes the SSH and SSL keys and certificates in RMC30, along with the certificate and SSH key
requirements.
CONTENTS
•
Section 1.8.1, "Certificate and Keys Life Cycle"
•
Section 1.8.2, "Certificate and Key Requirements"
Section 1.8.1
Certificate and Keys Life Cycle
Each RUGGEDCOM ROS device is shipped with an SSL certificate and RSA key pair, and a DSA host key pair for
SSH, that are generated at and provisioned by the factory. The administrator may upload a new certificate and
keys to the system at any time, which will overwrite the existing ones. In addition, CLI commands are available to
regenerate SSL certificate and key pair as well as the SSH host key pair.
There are three types of certificates and keys used in RUGGEDCOM ROS:
NOTE
SSH is not supported in Non-Controlled (NC) versions of RUGGEDCOM ROS.
NOTE
Network exposure to a ROS unit operating with the default keys, although always only temporary
by design, should be avoided. The best way to reduce or eliminate this exposure is to provision user-
created certificate and keys as quickly as possible, and preferably before the unit is placed in network
service.
• Default
A default certificate and SSL/SSH keys are built in to RUGGEDCOM ROS and are common across all RUGGEDCOM
ROS units sharing the same firmware image. In the event that valid SSL certificate or SSL/SSH key files are not
available on the device (as is usually only the case when upgrading from an old ROS version that does not
support user-configurable keys and therefore does was not shipped with unique, factory-generated keys), the
SSH and SSL Keys and Certificates
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Chapter 1
Introduction
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