Datakom DKM-409 PRO AT, Руководство пользователя

Страница: 17 / 66

DKM-409 Pro AT User Manual Rev_02 Firmware V-2.5
Structure: Relay output, normally open, free contact output
Max switching current: 5A @250VAC
Max switching voltage: 250VAC
Max switching power: 1250VA
Structure: RS-485, isolated.
Connection:
3 wires (A-B-GND). Half duplex.
Baud rate: 2400-115200 bauds, selectable
Data type: 8 bit data, no parity, 1 bit stop
Termination: External 120 ohms required
Common mode voltage: -0.5 VDC to +7VDC, internally clamped by transient suppressors.
Max distance:
1200m @ 9600 bauds (with 120 ohms balanced cable)
200m @ 115200 bauds (with 120 ohms balanced cable)
Isolation: 500VAC, 1 minute
The RS-485 port features MODBUS-RTU protocol. Multiple modules (up to 128) can be paralleled on the
same RS-485 bus for data transfer to automation or building management systems.
The RS-485 port provides also a good solution for distant PC connection where RainbowPlus program
will enable programming, control and monitoring.
RS-485 BUS STRUCTURE
A maximum of 32 devices can be paralleled on a RS-485 bus. For more devices on one bus, repeaters
must be used.
The bus must be terminated from both ends with 120 ohm resistor.
The cable shield should be grounded from one end only.
A B A B A B A B
120R 120R
3.5. RELAY OUTPUTS
3.6. RS-485 PORT
The Modbus register list is available at the MODBUS
section of this manual.
The device does not have any internal terminating
resistors. External 120 ohm resistor should be added
to both extremities of the bus line.