TECO speecon 7200ma - RS-485 Communication Interface; MODBUS Protocol Communication

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D. RS-485 Communication Interface
•7200MA RS-485 interface (terminal S(+), S(-)) can provide MODBUS protocol
for communication. The PROFIBUS protocol for communication is possible if the
user adopt the PROFIBUS option card (MA-SP).
•Wiring diagram of MODBUS and PROFIBUS-DP:
(a) MODBUS protocol communication
RS-485
CONTROLLER
DATA(+)
DATA(-)
Tx
Rx
RS-232
CONTROLLER
RS-485/RS-232
conversion CKT
7200 MA
M1
S(+)
S(-)
E
P
Rx
Tx
220
Ω
7200 MA
M2
S(+)
S(-)
E
P
7200 MA
S(+)
S(-)
E
P
M31
220
Ω
Fig. 51 Wiring for MODBUS Protocol communication
Note :1. A Host Controller with RS-485 interface can communicate with the
7200MA unit through RS-485 interface connection directly. If the Host
Controller does not provide the RS-485 port and its RS-232 port is available,
an RS-485/RS-232 conversion card should be used to connect between this
Host Controller and 7200MA unit.
2. A MODBUS Host Controller can drive the network with no more than 31
drivers connected, using MODBUS communication standard. If the driver
(e.g., 7200MA drive) is at the end of the network, it must have the
terminating resistors 220Ω at both terminals. All other drives in the system
should not have terminators.
3. Please refer to “7200MA RS-485 MODBUS Communication Application
Manual”.