User's Manual

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HID Corporation, 9292 Jeronimo Road, Irvine, CA 92618-1905, USA •Tel: [phone], Fax: [phone]
http://www.hidcorp.com MaxiProx Reader Installation Manual 5375-900 REV 06
Page
16
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 4.3
4.3 RS232 and RS422 Card Message Specification (Send Mode Only)
RS232 and RS422 Card Message Specification (Send Mode Only)RS232 and RS422 Card Message Specification (Send Mode Only)
RS232 and RS422 Card Message Specification (Send 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>
The checksum was computed by adding 00 + 01 + 23 + 4A + BC + DE = 208 hex. The checksum is the least
significant 8 bits of this result or 08 hex. The communications settings are 9600-75Hz BAUD, 8 bits, 1 stop
bit, no parity.