Siemens bt300 Operator's Manual page 150

Chapter 4 - Parameters and Menu Structure
I/O and Hardware (M5)
No. of registers HI
No. of registers LO
ERROR CRC HI
CHECK CRC LO
Message frame:
Exception Response:
Answer Slave - Master:
ADDRESS
FUNCTION
ERROR CODE
ERROR CRC HI
CHECK CRC LO
Reply frame:
Quick Setup
For monitoring of objects using ModBus RTU complete the following steps:
1. Select:
Main Menu > I/O and Hardware (M5) > RS-485 (M5.8) > Common settings (M5.8.1) > Protocol >Edit.
2. Select ModBus RTU.
3. Select:
Main Menu > I/O and Hardware (M5) > RS-485 (M5.8) > ModBus RTU (M5.8.3) > Parameters (M5.8.3.1) >
Slave Address (M5.8.3.1.1) > Edit.
4. Enter desired address.
5. Select:
Main Menu > I/O and Hardware (M5) > RS-485 (M5.8) > ModBus RTU (M5.8.3) > Parameters (M5.8.3.1) >
Baud Rate (M5.8.3.1.2) > Edit.
6. Select desired baud rate.
7. Select:
Main Menu > I/O and Hardware (M5) > RS-485 (M5.8) > ModBus RTU (M5.8.3) > Parameters (M5.8.3.1) >
Parity Type (M5.8.3.1.3) > Edit.
8. Select desired parity type.
150 | 180
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00 hex Invalid number of registers 0005 hex (= 5)
05 hex
34 hex
66 hex CRC field 3466 hex (= 13414)
01 04 17 70
01 hex Slave address 1 hex (= 1)
84 hex Most significant bit set to 1
04 hex Error code 04 => Slave Device Failure
42 hex CRC field 42C3 hex (= 17091)
C3 hex
01 84 04 42 C3
Siemens BT300 HVAC Drive
00 05 34 66
DPD01809
2016-06-07