Siemens SITRANS LR 300 Instruction Manual page 75

P771 Bus Address (for Modbus)
Allocates the unique identifier of the SITRANS LR 300 on the network for the RS-485 port.
Values
For devices connected with a serial Modbus slave protocol, this parameter is a number
from 1-247. The network administrator must ensure that all devices on the network have
unique addresses. Do not use the value 0 (zero) for Modbus communications because
this is the broadcast address and is inappropriate for a slave device.
P772 Baud Rate
Sets the communication rate with the master device.
Values
This specifies the rate of communication in Kbaud. Any value may be entered, but only
the values shown are supported. The baud rate should reflect the speed of the connected
hardware and protocol used. For updating software, you must use 9600 baud.
P773 Parity
Sets the serial port parity for the RS-485 port.
Values
Notes:
• Ensure that the communications parameters are identical between the
SITRANS LR 300 and all connected devices.
• If 7 data bits are chosen for Modbus ASCII, then parity must be set to either 1 (odd)
or 2 (even), and not to 0 (no parity).
•
P774 Data Bits and Stop Bits
There are eight data bits and one stop bit.
7ML19985CL02
0 to 99999
Range:
Pre-set: 1
(F = 9.6)
4.8 4800 baud
9.6 9600 baud
19.2 19,200 baud
38.4 38,400 baud
(F = 0)
0 No Parity (default)
1 Odd Parity
2 Even Parity
SITRANS LR 300 – INSTRUCTION MANUAL
(F = 1)
Page 73