User manual

V002450_25_CR1200-CR2-CR3-CR2500-CR3500_Interface_Configuration_Document_CLIENT.docx

2011-04-27 Page 7 of 65

•

14870 S. Pony Express Rd., Suite 200, Bluffdale, UT 84065

•

(801) 495-2200

•

FAX (801) 495-0280

cmd-packet-number: any byte value in the range [80-ff]; increments with each packet; does not

increment with resends; used with all packets other than z and a

timestamp (4 bytes): big-endian 32-bit number, indicates timestamp in seconds (relative to Reader

power-up or last time set in Reader) (For all but z packets, the timestamp

represents the time the packet was sent to the Host; for z packets, the time the

code was read.)

timestamp (3 bytes): three characters in range [0,127], most significant character first, indicates 21-bit

timestamp in seconds (relative to Reader power-up or last time set in Reader) (for

all but z packets, the timestamp represents the time the packet was sent to the

Host; for z packets, the time the code was read)

data-size: big-endian 16-bit number indicating size of the data field (in bytes)

character: byte

| keyboard-sequence

byte: any byte value in range [0x00,0xFF]

keyboard-sequence: key

| shift↓ key shift↑

| alt↓ decimal-code alt↑

key: ~ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | =

| q | w | e | r | t | y | u | i | o | p | [ | ] | \

| a | s | d | f | g | h | j | k | l | ; | ’

| z | x | c | v | b | n | m | , | . | /

| space

| esc | tab | shift | alt | ctrl | enter | backspace

| f1 | f2 | f3 | f4 | f5 | f6 | f7 | f8 | f9 | f10 | f11 | f12

| digit

decimal-code: digit | digit digit | digit digit digit (range [0,255])

digit: keypad0 | keypad1 | keypad2 | keypad3 | keypad4

crc16: big-endian 16-bit number representing crc16 of the packet, calculated over the

entire packet, excluding the crc16 itself. (See source files crc16.[hc] (Appendix)

for details on the crc16 algorithm and polynomials to be used.)

crc14: two consecutive bytes, each in range [0,127], representing a crc16 bitwise AND

with 0x7f7f, most significant byte first. The packet crc16 is calculated over the

entire packet, excluding the prefix and the crc14 itself. (See source files

crc16.[hc] (Appendix) for details on the crc16 algorithm and polynomials to be

used.)

The following packet-types are defined: