7RS232C Interfaces

7.3Communication Specifications

[Communication parameters]

 

Communication method

Start-stop system, text communication

 

 

Communication speed

9600 bps

 

 

 

Stop bit

1 bit

 

 

 

Data length

8 bits

 

 

 

Parity

None

 

 

 

Terminate

CR (both transmission and reception)

 

 

Flow control

None

 

 

[Single channel and multi-channel]

 

 

 

 

 

 

 

 

 

Single channel

 

Multi-channel

 

Topology

Cross

Ring

 

ID

Unnecessary

Host device 0

 

 

 

Drivers 1 to 9

 

Destination specification

Unnecessary

Add the destination ID at the beginning of the packets

 

 

 

From the host device to drivers: n****CR (n: slave station ID)

 

 

 

From drivers to the host device: 0n****CR (n: slave station ID)

[Transmission from the host device to drivers]

The number of characters to be transmitted should be 128 letters or less, including the slave station ID, recognition key, transmission character string, and CR.

Single channel

Multi-channel

 

Recognition

Transmission character string

CR

 

key

 

 

 

 

 

 

 

Slave

Recognition

Transmission character string

CR

station ID

key

 

 

[Response from drivers to the host device]

The number of response characters should be 128 letters or less, including 0, slave station ID, recognition key, transmission character string, and CR.

Single channel

Multi-channel

 

 

Recognition

Response character string

CR

 

 

key

 

 

 

 

 

 

 

 

 

0

Slave

Recognition

Response character string

CR

station ID

key

 

 

 

[Recognition key]

The recognition key is a function provided so that the host device can recognize that a response is a reply to a specific transmission by the host device. A maximum of 15 “!” characters can be included in the recognition key part. If more than 15 are added, the remainder of the number divided by 16 is processed as the actual recognition key number.

When the host device transmits a message to a driver and attaches N recognition keys to the transmission character string, the driver will send a response message back in which it attaches N recognition keys to that transmission character string. If, for instance, the host device issues a transmission character string to a driver that does not generate an immediate response, the host device may issue the next transmission character string before the response is returned. In such cases, it becomes difficult for the host device to recognize to which transmission character string the response character string returned afterward is issued. In this case, by issuing transmission character strings with different recognition key numbers, it becomes possible to judge to which transmission character string a particular response corresponds, simply by obtaining the recognition key number as the response is received.

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Parker Hannifin G2 manual Communication Specifications

G2 specifications

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