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5.0 OPERATION
Once you have configured each Model 1065 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 1065 Series features seven front panel status LEDs that
indicate the condition of the modem and communication link. Figure 5
shows the front panel location of each LED. Following Figure 6 is a
description of each LED's function.
5.1.1 The “TD” and “RD” Indicators
The Power LED glows green to signal power present. The “TD” and
“RD” indicators blink green with data activity. Off 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 be off if the connections
are correct and the RS-232 device is in an idle state.
5.1.2 The “RTS” and “CD” Indicators
The “RTS” and “CD” indicators are monocolor and will be off 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.
5.1.3 The “Test” Indicator
The yellow“Test” LED indicates that V.52 or V.54 tests are running.
5.1.4 The “Error” Indicators
The “Error” indicator LED has two functions:
A. When the 1065 unit is in test mode (green “Test” LED is lit), the
error LED glows red when bit errors occur.
B. When not in test mode (green “Test” LED is off), the error LED
is used to indicate an RTS streaming condition. (See Section 5.2) for
information on the anti-streaming circuitry.
5.2 ANTI-STREAMING ERROR INDICATOR
When not in test mode (green “Test” LED is off), the front panel
“Error” LED is used to indicate a streaming error. When the Model
1065s’ anti-streaming circuitry is enabled, the RTS signal from the DTE
is timer controlled. The timer begins to count when the DTE raises
RTS. If the time period that RTS remains high exceeds the preset time
out period, the anti-stream circuit will force RTS low. The “Error” LED
will light red, indicating a streaming condition (RTS continually on).
This feature prevents a malfunctioning terminal from tying-up a com-
puter port in a multi-drop or polling environment. When the DTE drops
RTS, the anti-streaming timer is automatically reset and the front panel
“Error” LED turns off. The time out period is DIP switch selectable for
12.5 or 50 seconds.
Figure 6. Model 1065 front panel.
Model 1065 Industrial Short Range Modem
TX
Power
RX
RTS
CD
Error
Test
V.54 Test
Modes
511 -
511E -
- Remote
- Normal
- Local
