ib technology
Message
Command to return product and firmware identifier string to host.
B7
B0
Command:
Reply:
0 1 1 1 1 0 1 0
(0x7A)
“b IDE RWD H1 WD (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 that the serial communication uses hardware handshaking to inhibit the host from
sending the Micro RWD commands while Tag interrogation is in progress.
NOTE also that for the Read Tag command, if an error flag has been set in the Acknowledge
code then there will be NO following data.
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.
B7
B0
Command:
Argument1:
Argument2:
0 1 0 1 0 0 0 0
x x N N N N N N
D D D D D D D D
(0x50)
(N = EEPROM memory location 0-127)
(D = data to write to EEPROM)
Acknowledge: 1 1 X F X X X F
(F = Status flags)
Internal EEPROM memory map
Byte 0: Tag Polling Rate (x 2.5 ms) (default 100ms)
Byte 1: Wiegand data length 4 to 34 bit (even number), 0x00 = OFF (NO Wiegand output), default = 30 bit
Byte 2: Reserved (Checksum)
Byte 3: Encryption ON/OFF control byte (0x00 = OFF)
Byte 4: ) 32 bit Encryption seed (M.S byte)
Byte 5: )
Byte 6: )
Byte 7: ) (L.S byte)
Byte 8: Reserved
Byte 9: Reserved
Byte 10: Reserved
Byte 11: Reserved
7
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