Bender FTC470XMB, Operating Manual

Page: 33 / 100

33 TGH1367en/06.2010
6. Function
The following tables describe the bus communication from the Modbus RTU Master’s point
of view. Possible answers from the protocol converter FTC470XMB to the Master’s request
are listed in the table below. The following data types are described:
●
Alarm messages
●
Operating messages
●
Measuring values
●
Requesting and setting the parameters
●
Taking over the Master function
●
Control commands
The tables contain the following information in columns:
●
Function
●
Addressable BMS devices
●
BMS address and channel (Word 2)
●
BMS instruction code (Word 3, only Low-Byte)
●
BMS data type (Word 4, only Low-Byte)
●
BMS data value (Word 5)
Word 1 is not listed in the table. The ID number included in Word 1 is generated by the Mod-
bus Master according to the programmer’s input.
Detailed information about the data format can be found in “Communication between Mod-
bus RTU and BMS” on Page 27.
Please note that the tables used in this chapter primarily describe mode 2
(page 25). The datagram format (Word 1...5) is valid for this mode only.
For mode 1 application (page 19), only instruction codes 4, 30, 32, 35, 37, 39, 48
and 105 are available. In this mode, only the data type and value are required for
readout.
The columns of the table are hierarchical sorted according to
command, data type, data value