Installation
18
© Lutz-Jesco GmbH 2020
BA-46020-02-V04
Multi-Channel Controller
TOPAX
®
MC
Operating instructions
7.10 RS485 interface
Fig. 19: Jumper position on RS485
i
When using multiple devices on a data line you, must activate
a 120 Ω resistance on the last device. You can activate the re-
sistance by setting the jumper to “ON” as shown in Fig. 19
“Jumper position on RS485” on page 18.
Your device can have an optional RS485 interface. Using a second data
cable you can connect up to 14 devices with a PC or a PLC. Modbus RTU
protocol serves as a protocol for data transfer. You can use the addresses
1 to 14. The addresses 0 and 15 are reserved for internal purposes and
are not supported.
RS485 Modbus settings:
n
Baud rate: 9600
n
Word length: 8 Bit
n
Stop bit: 1 Bit
n
Parity: None
n
You can read out a maximum of 40 addresses at once.
The list of Modbus commands can be found in section 12 “Modbus ad-
dresses TOPAX® MC” on page 39.
Perform the following work steps:
1.
Open the device housing.
2.
Connect a two-wire cable to terminals A and B of the RS485 module.
3.
Connect the device with your network.
ü
Device connected with network.
ON
OFF
A B
A B
