90
UMG 509
RS485 interface
The MODBUS RTU protocol with CRC check
on the RS485 interface can be used to access the data
from the parameter and the measured value lists (see
RS485 configuration).
Modbus functions (master)
01 Read coil status
02 Read input status
03 Read holding registers
04 Read input registers
05 Force single coil
06 Preset single register
15 (0F Hex) Force multiple coils
16 (10Hex) Preset multiple registers
23 (17Hex) Read/write 4X registers
Modbus functions (slave)
03 Read holding registers
04 Read input registers
06 Preset single register
16 (10Hex) Preset multiple registers
23 (17Hex) Read/write 4X registers
The sequence of bytes is high before low byte (Motorola
format).
Transmission parameters:
Data bits: 8
Parity: None
Stop bits (UMG 509): 2
External stop bits: 1 or 2
Number format: short 16 bit (-2
15
to 2
15
-1)
float 32 bit (IEEE 754)
The message length must not exceed
256 bytes.
C
Broadcast (address 0) is not supported
by the device.
C
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