H2PROT Datasheet, PDF (6/9 Pages) rfsolutions.ltd – Typical application configuration for Micro RWD module

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Message
Command to return product and firmware identifier string to host.
Command:
B7
B0
01111010
(ASCII “z”, 0x7A)
Reply:
“a IDE RWD H2 (SECx V1.xx) DD/MM/YY” 0x00
Returned string identifies author, product descriptor, project name, firmware version no.
and date of last software change. Note that the string is always NULL terminated. The
string begins with a unique lower case character that can be used to identify a particular
version of Micro RWD.
NOTE:
1) The serial communications uses hardware handshaking to inhibit the host from
sending the Micro RWD commands while Tag interrogation is in progress.
2) Following the Read Tag command, if an error flag has been set in the
Acknowledge code then there will be NO following data.
3) The serial communications system and protocol allows for a 10ms ‘window’
every Tag polling cycle indicated by the BUSY line being low. During this
‘window’ the host must assert the first start bit and start transmitting data. The
BUSY goes high again 10ms after the last stop bit is received.
4) Only one command sequence is handled at a time.
Program EEPROM
The Micro RWD has some internal EEPROM for storing system parameters such as
passwords and authorised identity codes. This command sequence allows individual
bytes of the EEPROM to be programmed with new data. Note that due to the
fundamental nature of these system parameters, incorrect data may render the system
temporarily inoperable.
Command:
Argument1:
Argument2:
B7
B0
01010000
NNNNNNNN
DDDDDDDD
Acknowledge: 1 1 X F X X X F
(ASCII “P”, 0x50)
(N = EEPROM memory location 0- 255)
(D = data to write to EEPROM)
(F = Status flags)
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