Modbus Rtu (M5.8.3) - Siemens bt300 Operator's Manual

Chapter 4 - Parameters and Menu Structure
I/O and Hardware (M5)
1. Complete all settings required for Monitoring as listed above.
2. Set Control Place Auto (P1.15 or P3.2.1) to a value of FieldbusCTRL.
To command Start/Stop through the P1 protocol, and Speed Reference through an Analog Input, complete the
following steps:
1. Complete all settings required for Monitoring as listed above.
2. Set Ctrl. Place Auto (P3.2.1) to a value of FieldbusCTRL.
3. Set FieldbusCtrl Ref (P3.3.9) to a value of AI1 or AI2 (depending upon which AI is in use).
To command Start/Stop through a Digital Input, and Speed Reference through the P1 protocol, complete the
following steps:
1. Complete all settings required for Monitoring as listed above.
2. Set Ctrl. Place Auto (P3.2.1) to a value of I/O Control.
3. Set I/O A Ctrl Ref (P3.3.3) to a value of Fieldbus.

Modbus RTU (M5.8.3)

Modbus RS-485 Parameters and Monitoring Values
Structure Parameter
Parameters
P5.8.3.1.1 Slave Address
P5.8.3.1.2 Baud Rate
P5.8.3.1.3 Parity Type
P5.8.3.1.4 Stopbits
136 | 180
Siemens Industry, Inc.
Building Technologies
Table 106: Parameters Related with Modbus Used through RTU.
Unit Min
1 247
bps 300 230400
None Even
1 Sb 2 Sb
Siemens BT300 HVAC Drive
Max Default ID
1 2320
6 2378
None 2379
2 Sb 2380
Description
Defines the Modbus RTU unique
device address.
Defines the communication speed
of the Modbus RTU network.
1 = 300
2 = 600
3 = 1200
4 = 2400
5 = 4800
6 = 9600
7 = 19200
8 = 38400
9 = 57600
10 = 76800
11 = 115200
12 = 230400
Defines the parity type of the
Modbus RTU network:
0 = None
1 = Odd
2 = Even
Defines the stop bits of the Modbus
RTU network:
1 = 1 Stop bit
2 = 1.5 Stop bits
3 = 2 Stop bits
DPD01809
2016-06-07