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724-746-5500 | blackbox.com
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724-746-5500 | blackbox.com
Chapter 6: Operation
6. Operation
6.1 LED Indicators
Hardened Serial Servers have LED indicators for Power, Serial Server Ready, Ethernet Speed and Link status, and Serial Port status.
Figures 6-1 through 6-3 show the location of the LEDs on the LES421A, LES422A, and LES424A servers.
2
3
1
4
Figure 6-1. Front and top panels of the LES421A.
Table 6-1. LEDs and switches on the LES421A serial server.
Number in Figure
6-1 LED Indicator Description
1 (1) Serial Port LED (P1)
The serial port has an associated LED. The Serial Port LED flashes (green) when data is being transmitted
or received on the serial ports. When the LED is illuminated, it indicates the serial port is open.
2 (1) Ready LED
The Ready LED (green) illuminates continuously while the unit is initializing. It flashes once per second
when the system is operating correctly. If the LED is not flashing, it indicates that something is wrong
(e.g., another device on the network at the same IP address).
3 (1) Ethernet Link LED
Lights when a connection is made.
Flashes when there is data traffic on the Ethernet link.
4 (1) Reset switch
A recessed momentary Reset switch is located on the side of the enclosure. To activate the switch,
insert a small plastic tool through the hole in the enclosure and press lightly.