General Software Information
5-5
Operating Parameters
The Encompass 4 Readers maintain their operating parameters in non-volatile mem-
ory (NVRAM) so that the parameters are preserved after a powe
r-down sequence.
Caution
To save user parameter changes to NV
RAM, you must send command #00 before
powering down the reader.
Power Fail
The system maintains a power fail flag. The host transmits command #520 Display
Power Fail Bit to determine if a power down has occurred. This flag is cleared by both
command #63 Reset Reader and command #65 Reset Power Fail Bit.
Program Download
Program download stores the Encompass 4 applications software into the reader’s
flash memory. Program download is used to install program upgrades, add features,
and to recover from corrupted program data.
Note: Pr
ogram download is a hosted process. Exercise caution so that you don’t inad-
vertently enter download mode.
Download Considerations
You should consider the following factors when performing program download:
• The Encompass 4 Reader does not process tags while in download mode.
• The Encompass 4 Reader does not accept any program data unless a successful
erase of flash memory has been performed before transmitting the data. Erasing
the flash memory typically takes two seconds.
• Exiting from download mode re-executes startup. If the new software has been
loaded without errors, the Encompass 4 Reader comes up in data mode. If a flash
checksum error is detected, the Encompass 4 Reader reenters download mode and
transmits a sign-on message with a boot version of 0.00x and without a serial
number.
Note: The Enc
ompass 4 Reader uses default communications parameters when oper-
ating in download mode
– 38400 baud, 8 data bits, 1 stop bit, no parity, basic protocol
– and does not echo commands.
Download Procedures
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