Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Chapter 2 - Installation
SNMP Access Gateway User’s Manual - v1.0 -- 11/99 - Page 6
Each RS-232 port has two LEDs associated with it. The left LED is a received data (RXD) LED. The right LED is
a transmitted data (TXD) LED. The TXD LED is normally on and green. The RXD LED is off when no cable is
connected to the serial port, and on when a cable is connected. Normally the RXD LED will be green as well. When
an RS-232 line is idle, the voltage is negative, and the LED shows green. When data is transmitted, the voltage goes
between positive and negative voltages and the LED turns red and green, so when data is transmitted or received on
a serial port the corresponding LED will flicker between red and green, which sometimes makes the LED look
yellow. These LEDs can be used to see that a cable is connected (the LED is lit) and that data is being transmitted or
received (the LEDs flicker between red and green).
The power LED has two uses. Normally the power led is lit constantly, with a quick flash once every ten seconds.
This ‘heartbeat’ signal on the power LED provides a quick indication that the SNMP Access Gateway is operating.
A second mode of use of the power LED is when the SNMP Access Gateway is in local command mode. When the
local serial port is in command mode, the power led flashes on and off at about a 1/2 second on, 1/2 second off rate.
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