Patton electronic 1080A-64 - Manual (Page 22)

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5.0 OPERATION
Once you have configured each Model 1080A Series unit properly and
connected the twisted pair and RS-232 cables (see Section 4.0), you are
ready to operate the units. This section describes reading the LED status
monitors, powering-up and using the built-in V.52 and V.54 test modes.
5.1 LED STATUS MONITORS
The Model 1080A Series features six front panel status LEDs that indi-
cate the condition of the modem and communication link. Figure 6 shows
the front panel location of each LED. Following Figure 6 is a description
of each LED’s function.
Figure 6. Front view of Model 1080A Series
The “TD” and “RD” Indicators
The “TD” and “RD” indicators blink red and green with data activity. Red
indicates a low RS-232 logic level, green indicates a high RS-232 logic
level.
Note RS-232 devices idle in a low state, so the LED will glow red if
the connections are correct and the RS-232 device is in an idle
state.
The “RTS” and “CD” Indicators
The “RTS” and “CD” indicators are bi-color and will glow red for a “low”
signal or green for a “high” signal. RTS lights for an incoming signal on
RS-232 pin 4. CD lights for an incoming signal on the line side, and the
resulting output signal on RS-232 pin 8.
The “Test” Indicator
The green “Test” LED indicates that V.52 or V.54 tests are running.
Model 1080 Universal Short Range Modem
TD RD RTS CD
V.54 Test
Modes
Remote
Normal
Local
Error Test
511
511E