Design Analysis H-350XL, Owner'S Manual

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XL™ Series
Hardware Options and Installation 2-15
2.4 Hardware Revision Detection
As the XL series data logger has continued to evolve, changes and enhancements involve both
the hardware and the firmware. The following list shows some of the major changes to the
hardware and how to check as a user what revisions may affect you. For example if your
application requires the +12Volt excitation to be switchable, then you must use board revision
3.1 or newer. The firmware can detect the board revision and if an old board is detected, then the
menu option to set the +12Volt excitation mode will not be displayed because it has no affect.
The table below shows the changes to the hardware over the life of the product.
Board
Revision Description
Rev 2.1 - Original board
Rev 2.2 - New Power down sequence from normal mode to low power mode.
This change will not affect the user operation.
Rev 3.1 - New 24 bit A to D converter for the generic analog inputs and stage sensor.
The older boards used a 16 bit A to D converter.
- Added differential mode to analog inputs 1 and 2.
- 500 millivolt range added to all generic analog inputs.
- The 12 volt excitation is able to be turned on and off.
- Able to use higher baud rates on the serial ports, now up to 115200 baud. The
older board would only go to 19200.
Rev 3.3 - A new 16 bit DAC is now used for the 4 to 20 milliamp output option. The
older boards used a 12 bit DAC.
- A new internal comm port for H-522 and H-522Plus is used for the built in
GOES radio. This allows com port 2 on the H-522 and H-522 Plus to still be
used for other purposes.
From the built in keypad / display interface the user can see what board revision is in use. Under
the ‘System Status’ menu is a status screen that will show the board revision, for example:
Hardware Rev = 3.1