Datakom DPR-350 Series, Руководство пользователя

Страница: 17 / 72

DPR-350 User Manual Ver_01 Firmware V-1.0
Structure: RS-485, isolated.
Connection: 3 wires (A-B-GND). Half duplex.
Baud rate: 2400-115200 baud, adjustable.
Data type: 8 bit data, no parity, 1 bit stop
Termination External 120 ohms required.
Common mode voltage:
-0.5 VDC ... +7VDC, internally clamped by transient suppressors.
Max. Distance: 1200m @ 9600 baud (with 120 ohm balanced cable)
200m @ 115200 baud (with 120 ohm balanced cable)
Isolation: 500VAC, 1 minute
The RS-485 port supports MODBUS-RTU protocol. Multiple modules may be paralleled on the same RS-
485 line in order to provide data transfer to automation or building management systems.
The RS-485 port provides an effective solution for distant PC connection to enable programming and
monitoring via SCADA software.
RS-485 LINE STRUCTURE
Up to 32 controllers can be connected in parallel on a single RS-485 line. A repeater is required in order
to connect more controllers.
A B A B A B A B
120R 120R
The line must be terminated by 120 ohms on each end.
The cable shield must be grounded at one end only.
3.6. RS-485 PORT
The Modbus register list is available at Datakom
technical support.
There is no termination resistor in the controller.
120 ohm termination resistors must be installed at
each end of the line.
Cihaz içinde sonlandırma direnci yoktur.
Haberleşme hattının her ucuna 120 ohm sonlandırma
dire
nci takılmalıdır.