Escort LRP2000 manual Standard ABx Protocol, Single Tag Example, Multi-tag Example

RFID Communications

6.4 Standard ABx Protocol

The ABx standard is a binary protocol, word (2-byte) oriented, so the syntax table reports the most significant byte (MSB) and the least significant byte (LSB). In the serial transmission, the MSB is transmitted first.

Table 17: Single Tag Example

Field	Number	Content
	of Bytes
Header	1	AAH
Command	1	Command Code
Start Address	2	One word gives the first byte of tag memory to be accessed
Number of Bytes	2	One word gives the number of contiguous bytes to be accessed. Not used on 07H,
		08H, 14H, 16H
Block Addresses	2	The first byte gives the address of the first block. The second byte gives the
		number of blocks to be interrogated. Only used with command 14H
Timeout	2	0001H to FFFEH milliseconds
Data	varies	Data that is written to a tag. Each byte is included in the LSB of a two-byte word
Terminator	2	FFFFH

Table 18: Multi-tag Example

Field	Number	Content
	of Bytes
Header	1	AAH. Always the MSB of the first word of an ABX Standard command
Command	1	Command Code - LSB of the first word
Family code	1	00H to address all tags in field
Reserved	1	Reserved for future use, set to 00H
Start Address	2	One word gives the first byte of tag memory to be accessed
Number of Bytes	2	One word gives the number of contiguous bytes to be accessed. Not used on
		commands 87H, 88H, 91H, 8BH, 8CH
Block Addresses	4	The first word gives the address of the first block. The second word gives the
		number of blocks to be interrogated. Only used with command 91H
Timeout	2	0001H to FFFEH milliseconds
Data	varies	Data that is written to a tag. Each byte is included in the LSB of a two-byte word.
Terminator	2	FFFFH

59 LRP2000 Passive Reader/Writer