A
LIEN
R
EADER
P
ROTOCOL
C
HAPTER
4
R
EADER
I
NTERFACE
G
UIDE
D
OC
. C
ONTROL
# 8101938-000 R
EV
05
46
HeartbeatAddress Examples
Command
Response
>get HeartbeatAddress
HeartbeatAddress = 255.255.255.255
Command
Response
>set HeartbeatAddress =10.1.70.17
HeartbeatAddress = 10.1.70.17
HeartbeatCount
9800 |
9780
|
8780
|
9640
|
9774
The HeartbeatCount property specifies how many heartbeat messages the
reader broadcasts after it boots. After this point the reader stops sending
heartbeat messages until the HeartbeatCount is changed, or the reader is
rebooted.
The range of values for HeartbeatCount is –1 to 65535.
The default value of –1 indicates that the reader should send heartbeat
messages indefinitely.
HeartbeatAddress Examples
Command
Response
>get HeartbeatCount
HeartbeatCount = -1
Command
Response
>set HeartbeatCount = 5
HeartbeatCount = 5
Time Commands
The time at which tags are read by a reader is particularly important for many
applications. For this reason, the reader has three time commands to ensure that
the onboard real-time clock is always set accurately.
TimeServer
9800 | 9780 | 8780 | 9640 | 9774
The reader uses the Internet to accurately set its internal clock every time it is
rebooted. The protocol it uses is called the Daytime Protocol (RFC-867) which
typically returns the time in UTC format.
In order to use this feature, a TimeServer must be specified. This is the network
address of a machine that is constantly running the Daytime Protocol. In the US
there are a number of machines owned and operated by the Government
explicitly providing the time and date to Internet users.
By default the reader is configured to connect to one of these machines
on boot-up to get the current time.
For a more in-depth description of this server, and a list of other publicly
accessible Daytime Protocol Servers, see:
http://www.boulder.nist.gov/timefreq/service/its.htm
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