User's Manual

CHAPTER 3

Operations at the Application Level

delay

Interruption delay is 7200 seconds

SET ECHO/NOECHO

This command is deprecated in emu3ap. It has been included for

compatibility purposes, but always returns OK. The behavior of the

emu3ap software is that ECHO is always on. You can also PING

and REQUEST data even for devices that are not shown in the

devices list.

Data Commands

This category included commands that return data from the

remote stations. The data collected from the stations is stored in

the on-board FIFO memory; it can be retrieved based on the sta-

tion ID and the time stamp. This means that if speciﬁc data was

retrieved, it can be retrieved again later as long as an appropriate

command is given. The data is stored in frames for each station

and each time slot (that is, every 15 minutes). The data can be

retrieved in any order, each device having its own internal pointers

managed by the system. As new data comes in, the old data is

overwritten; a “garbage collector” takes care of that. The com-

mand that allows this data retrieval is presented below.

GETBLOCK

DESCRIPTION Returns a block of data found at the current position of the pointer,

for the speciﬁed device. If a date/time parameter is supplied, GET-

BLOCK searches and positions the internal pointer on that date/

time before returning the data block.

PARAMETERS The device ID and, optionally, the date/time parameter.

RETURNS A string of data depending on the device type, or an error mes-

sage. Some important error messages are 14 (no more data) and

15 (radio communication temporary breakdown). The latter means

that data might come later if the communication is reestablished.

REMARKS The number of concatenated frames in a block depends on the

frame length (the maximum is 1024 bytes in a block). The bytes are

sent without spaces, but with leading zeros if necessary.

EXAMPLE getblock 2006 25/5/2000 15:15:0

1905640F11361509DFC9F8000057AB7F0F1A006702AB7F0F0100

6F021905640F20361509D7C4F8000056A9830F19005B02A9830F

010060021905640F2F361509C9B2F8000056AA800F1A006B02AA