Материал: m012900e

242 • I/O modules

RS232C interface 750-650

Initialization of the module:

•set IR bit in the control byte to "1"

•transmit/receive functions are blocked

•output/input buffers are erased

•serial interface module will load its configuration data

Transmitting data:

•TR≠ TA: put characters into output bytes 0 to 2

•amount of characters is specified in OL0 to OL2

•TR is inverted and read out

•characters are put into output buffer if TR=TA

Receiving data:

•RR≠ RA: data in input bytes 0 to 2 characters are available

•amount of characters is specified in IL0 to IL2

•characters in IL0 to IL2 are read out

•RA is inverted and read out

•all characters are read when RR=RA

The transmitting and receiving of data can be done simultaneously. The initialization request has priority and will stop transmitting and receiving of data immediately.

Attention

Resetting the initialization bit can be performed with the following message.

Message: input buffer full (Bit 3)

Input buffer is full. Data which is being currently received is now lost.

Modular I/O System

ETHERNET TCP/IP

I/O modules • 243

RS232C interface 750-650

An example:

The module is initialized.

- The initialization bit in the control byte is set.

- After the initialization has been executed, the status byte will give back 000.0100.

Sending of the data string "Hello” in ASCII code:

-The first 3 characters and the buffer length of 3 are transmitted.

-The transmission request bit (TR) is inverted.

-As soon as TR=TA, the rest of the data can be sent.

-The last 2 characters and the buffer length of 2 are transmitted.

-The transmission request bit (TR) is inverted.

- As soon as TA = TR, the data has been transferred to the output buffer.

Modular I/O System

ETHERNET TCP/IP

244 • I/O modules

RS232C interface 750-650

-After the 3 characters have been processed, RA is inverted.

-If RA≠ RR, the receiving of additional characters will continue.

-After the characters have been processed, RA is inverted.

Attention

0 x 23 is a hexadecimal value

0101.1001 is a binary value

An X indicates that this particular value has no importance. XX indicates that the whole value has no importance.

Attention

For the process data configuration of these bus modules please refer to chapter "Process data architecture for MODBUS/TCP" in the process image description of the corresponding coupler/controller.

Modular I/O System

ETHERNET TCP/IP

I/O modules • 245

TTY interface 750-651

4.8.1.1.2 TTY Interface - 20mA Current Loop

750-651

Technical description

This technical description is only valid for hardware and software versions X X X X 2 C 0 3----. The product series number is printed on the right side of the module.

The following description is preliminary and is applicable to the factory preset configuration.

Many other operational modes are possible (please contact WAGO for the corresponding settings).

The interface module can operate with all WAGO-I/O-SYSTEM buscouplers (except for the economy type).

Modular I/O System

ETHERNET TCP/IP

246 • I/O modules

TTY interface 750-651

Description TTY:

The TTY interface module allows the connection of TTY-Interface devices to the WAGO I/O SYSTEM. The TTY Interface module can provide gateways within the fieldbus protocol. This allows serial equipment such as printers, barcode readers, and links to local operator interfaces to communicate directly by the fieldbus protocol with the PLC or PC Master.

This module does not support a higher level protocol. Communication is made completely transparent to the fieldbus allowing flexibility in further applications of the serial interface module. The communication protocols are configured at the Master PLC or PC.

The 128 byte input buffer provides for high rates of data transmission. When using slower transmission speeds, you can collect the received data with lower priority without loosing data.

The 16 byte output buffer provides for faster transmission of larger data strings.

Modular I/O System

ETHERNET TCP/IP