Figure 8 – Group connection diagram
Note:
It is strong suggestion that using another power source to power the communication card (MTR-1), If
the wire length over 25 meters. This prevents the MTR-1 go in an unpredictable condition by voltage drop.
2 Communication protocol for user monitoring (start)
2.1 Communication Interface
2.1.1
Connect with GTR82 via RS-485 interface
Connection
method1
Master device (RS-485)
Ù
GTR85 as slave device (RS485)
Master device UART configuration
9600 bps, no parity, 9 data bits, 1 stop bits
The leading 8 bits information defines as “Address”, when the 9
th
bit sets to 1 (or logic high), and it defines as
“Data” when the 9
th
bit sets to 0 (or logic low).
Information transmitting format
The master device transmitting information form includes three parts that are
Address
,
Command
as well as
Data
in three bytes.
Address represents the GTR85’s identified number.
Command represents with function group that master device invoke to be executed.
Data represents which exactly command that master device invoke to be executed.
Encryption
processing
Each byte of the transmitting information must be encrypted as follow; let’s say FID, the factory ID number, is
7