20. MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS
1.0 GENERAL
The Modbus capability conforms to the Modbus over Serial Line Specification & Implemen-
tation guide, V1.0. Both the Modbus RTU and Modbus ASCII protocols are implemented. This
5-page manual section presents key programmable Modbus features. Our detailed Modbus
manual can be downloaded from http://www.laurels.com/downloadfiles/modbus.pdf
Modbus RTU
Baud Rate ........... 300, 600, 1200, 2400, 4800, 9600 or 19200
Data Format ....... 1 start bit, 8 data bits, 1 parity bit, 1 stop bit (11 bits total)
Parity .................. None, Odd, Even (if None, then 2 Stop bits for 11 total)
Address .............. 0 for broadcast, 1-247 for individual meters
Modbus ASCII
Baud Rate ........... 300, 600, 1200, 2400, 4800, 9600 or 19200
Data Format ....... 1 Start bit, 7 Data bits, 1 Parity bit, 1 Stop bit (10 bits total)
Parity .................. None, Odd, Even (if None, then 2 Stop bits for 10 total)
Address .............. 0 for broadcast, 1-247 for individual meters
2.0 FRAMING
Modbus RTU: Message frames are separated by a silent interval of at least 3.5 character times.
If a silent interval of more than 1.5 character times occurs between two characters of the
message frame, the message frame is considered incomplete and is discarded. Frame Check =
16 bit CRC of the complete message excluding CRC characters.
Modbus ASCII: The message begins immediately following a colon (:) and ends just before a
Carriage Return/ Line Feed (CRLF). All message characters are hexadecimal 0-9, A-F (ASCII
coded). The system allowable time interval between characters may be set to 1, 3, 5 or 10
seconds. Frame Check = 1 byte (2 hexadecimal characters) LRC of the message excluding the
initial colon (:) and trailing LRC and CRLF characters.
3.0 COMMUNICATIONS SETUP
Parameters selectable via Instrument Setup software, downloadable and distributed on CD
ROM:
Serial Protocol ............................... Custom ASCII, Modbus RTU, Modbus ASCII
Modbus ASCII Gap Timeout ........... 1 sec, 3 sec, 5 sec, 10 sec
Baud Rate ....................................... 300, 600, 1200, 2400, 4800, 9600, 19200
Parity ............................................. No parity, odd parity, even parity
Device Address ............................. 0 to 247
To Next Page
Loading...