CEL-MAR ADA-4010A Podręcznik użytkownika - Strona 10

Przeglądaj online lub pobierz pdf Podręcznik użytkownika dla Konwerter mediów CEL-MAR ADA-4010A. CEL-MAR ADA-4010A 13 stron. Rs-485/rs-422 to rs-232 addressable converter
Również dla CEL-MAR ADA-4010A: Podręcznik użytkownika (16 strony)

Drukuj stronę

ADA-4010A

7.2. OPERATING IN ADDRESSABLE MODE

In this mode ADA-4010A operates as baud rate and data format converters and let you to connect not addressable RS322 interface

devices transmitting data with different baud rates and data frames format to RS485 Bus, and thus let to cooperate with not

addressable devices.

Example connection is shown on Fig.9.

Frame of protocol for not addressable devices connected to RS232 port of ADA-4010A on RS485 Bus should be created in the

following way:

ADDRESS ADA-4010A

Where:

ADDRESS ADA-4010A

FRAME OF NOT ADDRESSABLE DEVICES

ADA-4010A converter with set up addressing is listening constantly to frame on RS485 bus via RS485/22 port. If received frame

contains byte of address equal to converter address then another bytes of frame are received right up to silence on RS-485 bus equal

to 'space between frames in signs'. If the frame is received correctly, the address byte is deleted and transmitted over as typical to the

RS232 port.

In case of errors in received frame, it isn't transmitted to RS232 port. In this case should be send the previous frame. The frame

received from device connected to RS232 port is being tested of transmission errors and in case of their missing converter adds

address to beginning of frame and send it to RS-485 bus via RS485/RS422 port. Frame containing errors isn't being transmitted to

RS232 port. In case of transmitting of frames containing more than 950 bytes converter receive only 950 bytes and next are ignored.

ADA-4010A was equipped with separate buffers for RS232 and RS485/422 ports, therefore converter can operate at full duplex mode

on RS-422 and RS-485 (RS2) 4-wire bus.

Figure 9 presents possibility of using the addressable ADA-4010A baud rate converter.

RS-232

Device

ADA-4010A

Address 1

FRAME OF PROTOCOL FOR NOT ADDRESSABLE DEVICES

- one byte of address from 1-255 scope - set in the memory of ADA-4010A

during configuration in use of ADAConfig,

- free sequence of bytes containing the appropriate frame of connected device

of the RS2 port. Not longer than 950 bytes.

RS-232

Device

ADA-4010A

Address 2

Fig 9. Connection of not addressable RS232 devices to RS485 Bus

RS-485

Addressable

Device

RS-232

Device

ADA-4010A

Address 3

ADA-1040