7.3. Computer interactive interfacing: main protocol

This section defines fully the serial communications protocol implemented in the Format 550 Controller used on Sanyo Gallenkamp chambers and rooms. This protocol allows a master computer (System Master) to communicate with one or more Controllers on a network.

Typical applications include:

where the chamber is required to operate interactively with the test proce- dure being applied to the test load within the chamber

where a simple record of the conditions of the chamber is required di- rectly into a logging system already being used.

The document describes in detail what a master computer should do to comply with the protocol.

This makes no assumption about the functionality of the master software. A particular Host Software package is available separately.

The protocol is defined in four layers:

Physical Layer defining electrical connections between controller & master

Frame Layer defining byte frame structure

Packet Layer defining information flow between controller & master

Information Layerdefining syntax of information passed

7.3.1 PHYSICAL LAYER DEFINITION

 

The medium used to connect Controllers) to master depends on:

 

the distance between master & Controller

 

the number of Controllers

 

Master to single Controller: Up to 50 feet

RS232

Up to 1000 feet

RS485

Master to several Controllers:

RS485 bus.

The Chamber itself has a 25 pin RS232 port (connector 'D' type DTE) which is used for communicating with the master. A RS232 to 485 adapter is used when a RS485 hook up is required. The adapter uses the RS232's RTS line to control the data direction oftheRS485port.

7.3.2COMMUNICATIONS FRAME DEFINITION

19,200 baud

1 start bit

8data bits

0parity bits

1 stop bit

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Sanyo 550 Computer interactive interfacing main protocol, Physical Layer Definition, Communications Frame Definition
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550 specifications

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