User's Manual Part 3

Hi-G-Tek Ltd. Microelectronics & Asset Tracking Technology
126
6
RS 485/232 Communication Protocol
6.4.2.3. Reader Messages Packed Data Format
Where:
PK
P#
Ch
The first byte is the total number of packets in
the string.
The second byte is the packet serial number.
The third byte is the channel number from which
the message is received.
Maximum total message length is 128 bytes.
Maximum Data* length is 115 bytes.
6.4.2.3.1. Packed Data from the LSC.
6.4.2.3.2. Packed Data from the READER.
When the packets originate with the LSC, each packet will be
transmitted after an appropriate response from the READER.
The LSC may retransmit the last packet upon receipt of a
response indicating that the last packet was not received
satisfactorily.
When the packets originate with the READER, each packet will be
transmitted after an appropriate acknowledgement from the LSC.
The READER may retransmit the last packet upon receipt of an
acknowledgment indicating that the packet was not received
satisfactorily