User's Manual

Date Code 20041005 Instruction Manual SEL-3021 Transceiver
Introduction & Specifications
Connections, Reset Button, and LED Indications
1.7
Reset Button
Use the {RESET} button to reset and delete all security related settings. You can access
the {RESET} button through the small hole in the end of the SEL-3021 near the status
LED. Use a paper clip or other similar device to press the {RESET} button for at least 2
seconds, which resets the SEL-3021 into a default state. Power must be applied to the
SEL-3021 for the reset operation to occur.
IMPORTANT: Pressing the {RESET} button erases all security
parameters and interrupts transmission of encrypted
data until you initialize the SEL-3021. See Initializing the
SEL-3021 on page 2.5 in Section 2: Installation.
Status LED
Use the status LED to determine the state of the SEL-3021. If the status LED is solidly
lit, the SEL-3021 is operating correctly. If the LED is blinking, the SEL-3021 is in a
failed or reset mode. Refer to Section 5: Testing and Troubleshooting for more details.
Table 1.2 DCE (Female DB9)
Pin Description
1 Data Carrier Detect (Output)
2 Transmitted Data (Output)
3 Received Data (Input)
4 Data Terminal Ready (Input)
5Ground
6 Data Set Ready (Output)
7 Request to Send (Input)
8 Clear to Send (Output)
9 Ring Indicator (Output)
Preliminary Copy