Siemens SENTRON PAC RS485 - Table 6-2 Structure of the Setting Versions; Figure 6-1 Configuring the PAC RS485 Expansion Module Using Buttons

Configuration
6.3 Configuration of the PAC RS485 expansion module on the SENTRON PAC3200 Power Monitoring Device
PAC RS485
Manual, 02/2008, A5E02091800B-01
59
Figure 6-1 Configuring the PAC RS485 expansion module using buttons
"Address":
Each expansion module has a unique address. You set this here. The addresses from 1 to
247 are supported.
NOTICE
Abnormal behavior of the bus with identical addresses
If several expansion modules have the same address, this can result in abnormal behavior
of the entire bus. Communication between the master and the slave devices connected to
the bus is interrupted.
Ensure that every expansion module has a unique address.
"Baud rate":
You set here the data transfer rate for the external communication of the PAC RS485
expansion module. The baud rate is stored in the non-volatile memory of the
SENTRON PAC Power Monitoring Device.
"Settings":
This is where you set the data bits, the parity bit and the stop bits for external
communication:
● 8E1 = 8 data bits, parity bit is even, 1 stop bit
● 8O1 = 8 data bits, parity bit is odd, 1 stop bit
● 8N2 = 8 data bits, no parity bit, 2 stop bits
● 8N1 = 8 data bits, no parity bit, 1 stop bit
Table 6-2 Structure of the setting versions
Digit Meaning Possible settings
1 Number of data bits 8
Even = The data bits are rounded up to an even
number.
Odd = The data bits are rounded up to an odd
number.
2 Parity bits
None = No parity bit is sent.
3 Number of stop bits 1 or 2
"Protocol":
You set the communication protocol here:
● MODBUS RTU
● SEAbus