UTEK UT-2204 Скачать руководство пользователя страница 2

        

        

      

Alarm and protection of RS-485 faults

Error alarm and protection of RS-485 interface is effective for 

connecting multiple RS-485 devices for improved reliability. UT-2204 

provides 4 subordinate ports used to determine quickly the faulty ports 

and the connected faulty devices according to fault indicators. If fault 

occurs then  relay will a ct and normally open contacts will be connected 

to the common point, so users can connect alarm bell or alarm light to 

the relay output terminal.

Power supply and lightning protection

UT-2204 is powered by an external compact switching  power sup ply

of 12V/1A. Other non-regulated voltage supply must not be used. This 

may cause product damaged. Each RS-485 port of the UT-2204 has a 

lightning protection of 1500W, and it can effectively prevent lightning 

and ESD. Port 4 of UT-2204 is the protective earth of surge protection 

and it's must be grounded correctly to avoid being not-used to ensure 

safe communication.

Application note

The data on Input 1 and Input 2 will be transmitted immediately to 

Output por t 1- port  4, and the data on any one port of Output port 1- port 4

will be stored to the data buffer and then forwarded to Input port 1- port 2,

so the time interval of Output port 1- port 4 should not be too short. For 

example, if the data input of port 1- port 4 last for 100ms for each channel, 

then each channel of port 1- port 4 should input data once for more than 

400ms and the input data length should be less than 100 bytes, or data 

may be lost.

4

5

Typical UT-2204 4-port RS-485HUB applications

1. 

4 RS-485 devices controlling 1-2 devices, in which the 4 devices 

    on the RS-485 bus can simultaneously control 1-2 devices

RS-485

 A

 Device

( UT-2204 )

OUTPUT1

OUTPUT2

OUTPUT3

OUTPUT4

3

 

Relay alarm signal output

SIGNAL OUT

No

Nc

COM

signal output

normally open

normally close

common

NO  NC  COM

2

 

Extension of 1-2 RS485 ports of a master to 4 RS-485 ports

RS-485

Master Device 1

( UT-2204 )

Port1

Port2

Port3

Port4

RS-485

INPUT1

INPUT2

OUTUT1

OUTPUT2

OUTPUT3

OUTPUT4

Controlled Device 1

Port1

Port2

Port3

Port4

RS-485

INPUT1

RS-485

INPUT2

RS-485

 B

 Device

RS-485

 D

 Device

Controlled Device 2

RS-485

 A

 Device

RS-485

 B

 Device

RS-485

 C

 Device

RS-485

 D

 Device

Master Device 2

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