100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
HA028910
Issue 13 Sep 16
User Guide
Page 287
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Message
Extension
message
(Space + 59 null
characters)
Space = hex 20; Null = 00
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00 00 00 00 00
Character no.
English message
ASCII (Hex)
8.2.5 Text messages
In order to increase effi ciency, it is possible to set the system to transmit screen messages (e.g. alarm on/
off) only when a new message occurs. This is done by continuously polling the ‘Text Length’ parameter
(in group data -
section 8.4.4)
to see if its value is non-zero. (This parameter contains the character count
of the latest message to occur since the last poll.)
If ‘text length’ is non-zero, the host must access the parameter ‘Read Text’ (also in group data) to read the
message, and it must also reset the ‘Text Length’ parameter to zero. This causes the recorder to look for
any further messages in the queue, and if there are, it will load the latest message into the area accessed
by ‘Read Data’, and then set ‘Text Length’ to the length of the new message. If the host fails to set Text
Length to zero after reading a message, no new messages will be read.
If ‘Text Length’ is zero, no new messages have been generated since the last poll.
LONG MESSAGES
All messages are terminated with a null character.
Messages of up to 60 characters (including the time and date and the terminating ‘null’) can be read by
the master device in a single transaction.
If the message contains more than 60 characters, one or more continuation messages of up to 60 char-
acters each are placed in ‘Read Text’, as soon as the previous message has been confi rmed as ‘read’. The
master can continue to read all these messages, until it detects a ‘null’ character. Intelligent masters can
then re-assemble the characters into a single message. Non-intelligent masters can treat the continua-
tion messages as separate messages sent at the same time as the fi rst message.
Notes:
1. If any of the messages is of less than 60 characters, the unused part of message is fi lled with
‘null’ characters (example 1). Thus, by reading character 60, the master can determine either
that this is the last message (character 60 = ‘null’), or that there is at least one message to follow
(character 60 is not ‘null’).
2. Continuation messages cannot contain only null characters. For this reason, if the message it-
self (i.e. excluding fi nal ‘null’ characters) is exactly 60 characters long (or a multiple of 60 charac-
ters long) then the fi nal extension message contains a space, followed by 59 ‘nulls’ (Example 2).
3. Time and date appear only in the main message, not the continuation message(s).
Example 1
Message of less than 60 characters
Example 2
Message of exactly 60 characters
