User's Manual

DRAFT TrimTrac 1.5 Technical Manual v0.3ab 106
Element Meaning
C Data string.
PPPPPPPP Security Password. Always 8 alphanumeric
characters, UPPER CASE ONLY.
Default
00000000
YYYYYYYY Unit ID. Always 8 alphanumeric characters,
UPPER CASE ONLY
. Default 00000000
ZZ 2-character checksum.
{x} Signifies that x can occur zero or more times
[x] Signifies that x may optionally occur once
Table 43, Basic Message Format
Message Framing
Each TrimTrac Application Protocol message is framed by the start, end ASCII
characters ‘>’, ‘<’, respectively. These characters are not allowed other than as
start-of-message and end-of-message indicators. Multiple TrimTrac Application
Protocol messages may be combined into a single SMS text message up to the
maximum number of 160 characters per SMS.
Message Qualifiers
A one-character Message Qualifier is used to describe the action to be taken on
the message. The following table lists the valid qualifiers:
Qualifier Action
Q Query for data or parameters (sent to TrimTrac 1.5)
S Set or configure parameters (sent to TrimTrac 1.5)
R Response to a query or a scheduled or autonomous
report (from the TrimTrac 1.5)
Table 44, Message Qualifiers
Data String
The Message Qualifier and the Message Identifier dictate the format and length of
the data string. The Data String can consist of any printable ASCII characters with
the exception of the > and < characters. Most messages are length sensitive and
many use the ‘;’ character as field separator. Data fields are fixed length
regardless of the values entered.
Security Password
A Security Password (denoted as “PW” in messages) must be used in all
communications with the TrimTrac 1.5. The default Security Password is set to
“00000000”; however, the TrimTrac 1.5 may be assigned any UPPERCASE