USER'S GUIDE ____________________________________________________________________
88 ___________________________________________________________________ M211187EN-C
Polled Mode
In the polled mode the FS11 sensor sends a data message when the host
computer transmits a polling command. The automatic message sending
mode is disabled by setting the message interval to zero with the
following command:
SET MESSAGE INTERVAL 0
The polling command format is as follows:
%
FS<id><
message_number
>
−
where
%
= The ASCII character number 5 (Ctrl E)
FS
= FS identifier
id
= The identifier selected in configuration, if replaced with
blank space all FS11 sensors on the line will respond
message
number
= Optional message identifier (two characters), if the
message number is omitted, the sensor answers with the
default message selected with the
SET MESSAGE
TYPE
command
−
= CR (ASCII 13)
Examples of polling commands:
%
FS
−
= If only one FS11 unit is on the line (no ID is
necessary)
%
FSA0
3
−
= The FS11 unit A (ID = A) is polled for message
number 03 (status message). This is used when
several devices are on the same line.
The FS11 sensor does not echo the polling character string.
For connecting several devices on the same modem line, see instructions
and example in Leased Modem Line DXL421 User’s Guide
M210636EN.
When there are several devices on the same modem line, the polled unit
turns the modem (DMX501 only) carrier on after it has acknowledged
the request. Turning on the carrier will cause extra characters to be added
in front of its first message character. The FS11 sensor waits for about
100 ms after the carrier has been turned on before it sends the message.
When FS11 has sent the message, it turns the carrier off causing another
set of extra characters that will also have to be ignored by the host.
