HID Corporation, 9292 Jeronimo Road, Irvine, CA 92618-1905, USA • Tel: (949) 598-1600, (800) 237-7769, Fax: (949) 598-1690
http://www.hidcorp.com
MaxiProx DFM Reader Installation Manual 5375-901 Rev D
Page
20 of 20
The bit stream will consist of 25 leading zeros, the message and fill with zeros until the end of the
message. The message will consist of a minimum of 210 bits.
Example
00000000000000000000000000 11010 10000 01000 11001 11111 00100 00000000000000...000000
B 1 2 3 F LRC
4.2.6 Output Specification
Vol = 0.8 V
Voh = 3.5 V
sink = 25 ma
source = 5 ma
4.3
4.3 RS232 and RS422 Card Message Specification (Send
RS232 and RS422 Card Message Specification (Send
Mode Only)
Mode Only)
When Access Cards (transponders) are presented to the MaxiProx Reader, the Reader sends a
message. The message is in the following format:
CCDDDDDDDDDDXX<CR><LF>
^ First character sent
All characters
C, D
and
X
are ASCII encoded, hexadecimal digits. (i.e., the hex value
7
is sent as an
ASCII character 7 or the hex value
E
is sent as an ASCII character
E
).
The
CC
field is reserved for use by HID Corporation. The valid values are
00
through
7F
.
The
DDDDDDDDDD
field is the transponders (Access Card) data. The valid values are
0000000000
through
1FFFFFFFFF
(ASCII).
The
XX
field is a computed checksum. The checksum is calculated by first grouping the message data
into the pairs
CC DD DD DD DD DD
. Each pair of characters represents one byte of data. Then each pair
of characters is converted from ASCII to their respective hex values. At this point, the 6 bytes are
added together. The checksum is equal to the least significant 8 bits of the result.
<CR>
is the ASCII code for a carriage return. (
0D
hex)
<LF>
is the ASCII code for a line feed. (
0A
hex)
For example, if the MaxiProx reads a transponder (Access Card) that contains the value
CC=00
and
DDDDDDDDDD=01234ABCDE
, the Reader will report the ASCII message
0001234ABCDE08<CR><LF>.
Note that each of the characters is ASCII encoded. The actual bytes (hex value) that are sent to the
host are:
<30><30><30><31><32><33><34><41><42><43><44><45><30><38><0D><0A>
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