User Guide

24
To enter the modbus parity, press the words Modbus Parity from Building Automation menu and select
desired modbus parity by UP or DOWN and ACCEPT.
Powers
TM
IntelliStation Jr. BAS Integration Manual
Communication Protocol Modbus over RS485
Physical Layer RS485 Two-Wire plus Signal Ground
Baud Rate 2400, 9600, 19200, 57.6k, 115k)
(default 19200 bps)
Recommended Cable 18 AWG Shielded Twisted-Pair (STP)
Transmission Mode RTU or ACSII (default RTU)
Maximum Cable Length Without terminating resistors
- 115,000 baud --> 177 m (580 ft)
- 57,600 baud --> 353 m (1,158 ft)
- 19,200 baud --> 1,000 m (3,280 ft)
- 9,600 baud --> 1,000 m (3,280 ft)
- 2,400 baud --> 1,000 m (3,280 ft)
With 2 x 120 Ohm resistors
- 115,000 baud --> 1,000 m (3,280 ft)
- 57,600 baud --> 1,000 m (3,280 ft)
- 19,200 baud --> 1,000 m (3,280 ft)
- 9,600 baud --> 1,000 m (3,280 ft)
- 2,400 baud --> 1,000 m (3,280 ft)
Start Bit 1 Bit
Data Length 8 Bits for RTU Mode
7 Bits for ACSII Mode
Parity None (2 Stop Bits)
Even (1 Stop Bit)
Odd (1 Stop Bit)
(default Even)
Addressing 1 to 247 (default 1)
Modbus
®
Specifi cations