Bender FTC470XMB, Руководство по эксплуатации

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The FTC470XMB protocol converter
19 TGH1367en/06.2010
4.4 Modbus RTU side of the FTC470XMB — Mode 1
In this manual, the Modbus RTU is generally viewed from the perspective of the Modbus RTU
Master.
4.4.1 Definition of Mode 1
If FTC470XMB is operating in Mode 1, the Modbus Master can query values and functions
from the BMS net, but a parameterization of network BMS devices is not possible. For the
respective requests, the Modbus Master must set the configuration registers of the
FTC470XMB. For this purpose, the registers are reserved with the following options:
●
BMS addresses : 1...150
●
BMS instruction codes: 4, 30, 32, 35, 37, 39, 48 and 105
4.4.2 Communication between Modbus RTU and BMS
The assignment of input data and output data is organized over the configuration registers
of the FTC470XMB. Therefore, the Modbus Master must set the configuration register con-
sisting of 10 segments in an appropriate way. 10 address ranges of the read register are per-
manently linked with the 10 segments of the configuration register. Details of these linkages
are described further below.
Description of data exchange
Communication between the components is carried out as follows:
1. The Modbus Master makes an request possible by setting the FTC470XMB configuration regis-
ter. It writes the BMS address of a BMS device to be queried and the associated BMS instruc-
tion. 10 segments allow 10 devices with 12 channels each to be configured for requests in one
configuration cycle.
2. Next, the Modbus Master reads the requested data from the Modbus read register of the
FTC470XMB. This can take place uniquely or in a cyclic manner, depending upon the program-
ming.
FTC470XMB can be operated in Mode 1 or in Mode 2 or even alternately. This is
possible since different memory ranges are used for both modes.