Design Analysis H-350XL, Owner'S Manual, Page: 61 / 272

XL™ Series
Serial Port Options 6-3
and test the unit. This is the default startup mode.
Cmd N/Echo
This is command mode with echo off. This mode is normally used for machine to
machine application. There are no prompts used to indicate the unit is ready.
Pressing the ENTER key three or four times will turn on the echo function and a
prompt will be displayed.
Cmd W/Echo This is command mode with echo on. This is normally used when a user
is hand typing the commands so that they can see what is being sent to the
logger. In this mode a command prompt is displayed indicating the unit is
ready to receive commands. The prompt is a simple arrow pointer “->”.
Network
This is a very specialized mode. This is a command mode similar to the
command mode with no echo. The prompt will never be displayed. In this mode
the unit will only respond to commands that are indended for this unit. To isolate
this unit from the others the site ID is used as part of the command and is placed
in brackets. For example:
{site1}time?
This would cause the unit called site1 to respond with its time. Any other unit
would not respond. Now the serial ports are normally used for point to point
communications. In this mode it is point to multipoint or one PC communicating
to two or more XL series data loggers. Normally this mode is only used with an
RS232 radio connected to the serial port and the radio link is what provides or
allows the multipoint functionality.
PC Interface View Built In Display Screen
F - Flow Control: SW
Flow Control [SW ]
Flow control is used to pace the data through the serial port. It is important not to send data faster
than the receiving system can receive it. There are two types of flow control, software and
hardware flow control.
Software flow control (SW) is also referred to as XON / XOFF. When this is enabled the
receiving system will send a character (XOFF) to the XL™ instructing it to stop sending data
until the receiving system can catch up. At the point the receiving system is ready it will send an
XON to the XL™ indicating it is ready for more data. When software flow control is selected it
will only be used during data transfers, not while navigating through the menus or by other
processes that use the serial ports. Software flow control is the default selection.
NOTE:
If using XMODEM protocol for data file transfers, software flow control should not be