Hardware 4-21
4.6 Ethernet Switch
The Ethernet switch allows flow of information between the Computer Control chassis, and the Data
chassis. The standard Ethernet switch, included with the recorder, is a five or eight port EISK series
unmanaged plug and play switch. The EISK switches are intended for commercial and industrial
applications. They have a wide temperature and operating range and comply with electromagnetic
compatibility and EFT/Surge standards.
The auto-negotiate protocol allows it to link with any compatible 10BASE-T or 100BASE-TX device. It
will allow function with any application layer that works with Ethernet, including Modbus/TCP or
Ethernet/IP. The switch has built-in broadcast storm control to prevent excess broadcasts from degrading
network performance.
To aid in troubleshooting, each port LED is lit solid if a valid link exists to an attached device, flashes to
show activity, and indicates data rate by color: green for 100Mbps and yellow for 10Mbps. A separate
green LED indicates the device is powered.
In most cases, power for the switch comes from a Data chassis or Computer Control chassis. Both Chassis
output 12VDC via the power supply circuit board terminal block. The 12VDC output is located on
terminals 3 & 4.
The following table lists the switch specifications.
Table 6: Switch Specifications
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