Brooks Automation
278580 Revision A
49
LF80C ZeniD RFID Reader
7 Operation
Product Manual
7.2 Operation of the ASC-I1 Protocol
R - Automatic read
The external input is used to trigger an automatic read action. The R
command sends the read data to the host. The host then has to confirm the
message.
Depending on the readmode configuration (parameter 1: readmode), the
reader reads the following pages:
Reading more pages (readmode "tag" or "whole"): protocol is repeated.
The end package includes the command 'R' and the source address '0'...'E'
No acknowledgment from the host: information is repeated with the
following parameters (
Î
Parameter 5 (0x05);
Î
Parameter 6 (0x06))
Reading not possible: repeated read time frame (
Î
Parameter 3 (0x03);
Î
Parameter 4 (0x04)).
Reading again not possible: tag sends error message no tag (4) to the host.
The delay time for the presence sensor is configurable (
Î
Parameter 0
(0x00)).
An automatic reading is only possible if all messages that have to be
confirmed have been confirmed by the previous read, or if the waiting
period (
Î
Parameter 5 (0x05)) has expired after the last sending (
Î
Parameter 6 (0x06)).
If the sensor check is activated, the status of a floating contact connected
to the external input is checked before a reading process (writing process)
is triggered. If it is not connected, the error message “NOTAG” is sent,
otherwise the read-process is started.
readmode =
page (0)
sequential read for different pages (parameter 2:
readpage)
readmode =
tag (1)
read a tag until the end character ('E' - end
character or 'F' empty) in ID bit 0…3
readmode =
whole (2)
read the whole tag (all pages)
Reader
→
Host
CMD
Reader ID
Page
Data
R
1 byte
2 bytes
16 bytes
Host
→
Reader
CMD
Reader ID
r
1 byte
