NIVELCO UNICONT PMG-500, User And Programming Manual, Page: 34 / 41

34 pmg511en21p01
Interface:
Type Description
Communication protocol Modbus RTU
Connection type RS485
Application standard EIA RS485 compliant
Maximum number of connections 31 unit (address: 01…99)
Synchronization method Asynchronous
Communication method 2-wire, half-duplex
Communication distance Max. 800 m
Communication speed 2400, 4800, 9600, 19200, 38400 bps
Communication response time 5…99 ms
Start bit 1-bit (fix)
Data bit 8-bit (fix)
Parity bit None, odd, even
Stop bit 1-bit, 2-bit
5.9.1 Unit Address Settings [PAR4 → ADRS]
Unique addresses can be assigned to units from 1 to 99. Default setting: 1.
5.9.2 BPS (Bits Per Second) Settings [PAR4 → BPS]
Set the data transfer rate.
Parameter Description / Range Default
BPS
24 (2400 bps) / 48 (4800 bps) / 96 (9600 bps) /
192 (19200 bps) / 384 (38400 bps)
96 bps
5.9.3 Communication Parity Bit [PAR4 → PRTY]
This parameter enables or disables the parity bit setting. The parity bit is a data communication method that adds
an additional bit to the transmitted data packet as an indicator for checking for data loss and damage. Default
setting: NONE.
Setting Description
NONE Disables parity bit.
EVEN Parity is even if the number of bits of value 1 in the data packet is even
ODD The parity is odd if the number of bits of value 1 in the data packet is odd
5.9.4 Communication Stop Bit Settings [PAR4 → STP]
The number of bits can be set to indicate the end of the transmitted data series. The number of bits can be 1 or
2 bits. Default setting: 2 bits.
5.9.5 Response Timeout Settings [PAR4→ RSwT]
Set a timeout to reduce communication errors when communicating with a slow master device (PC, PLC, etc.) .
After setting the waiting time, the controller responds after the specified waiting time. Default setting: 20 ms.
Note: Shorter latencies may cause communication errors in the master device.