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NE-4100 Series User’s Manual Serial Command Mode
9-9
Operation Flow Chart
ATTENTION
This flowchart represents a continual process. You can start trace out a logical flow by starting
anywhere on the chart.
Diamonds represent decision points. Only one path leading out of any diamond can be followed.
Configuring Trigger Type
Serial command mode may be triggered by either software or hardware. Initially, you may use one
of the following configuration tools to set the trigger type: Network Enabler Administrator, Telnet
console, web console, or serial console.
The hardware trigger involves using DIO 0 to enter serial command mode. The software trigger
involves using a three-character sequence sent to the serial port to enter serial command mode. For
hardware versions 1.1 or earlier, when the SW Trigger is enabled, the highest achievable data
transmission rate will be reduced from 234000 bps to 55000 bps. This is because all data received
through serial port 0 will be parsed. In other words, the system must continuously check the serial
port data for the SW Trigger characters. This is not an issue for hardware versions 2.1 and later.
Check Serial
Command
Mode Trigger
Normal
Serial-to-Ethernet
Function
Poll DIO 0
Status
Check Serial
Port Data
Enter Serial
Command
Process Command
Exit Serial Command Mode
and Restart
DIO 0 Low
(HW Trigger “On”)
3-characte
r
Trigge
r
Detected
DIO 0 High
(HW Trigge
r
“Off”)
Normal Data
Detected
SW Trigger
HW Tri
gg
er