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Controlling DriveRack™ products with RS-232: A quick start guide.

If you are using an AMX panel with a NetLinx control module, you are in luck. There is

NetLinx sample code available for the DriveRack 400 series processors. This code can

be used as a template to create your application. The 200 series and 400 series us the

same message format, and share all of the most often used messages. Adapting the

sample code to control a 240 or a 260 should be an easy task.

If you are not using an AMX NetLinx control module, you will need to perform a little

more programming on your chosen controller.

There are two modes of sending messages. Guaranteed Delivery and Data Gram. The

full handshake protocol for resynch and guaranteed delivery is described in a separate

document. A full implementation of the protocol is recommended to provide fault

tolerant communication with DriveRack products. Generating and responding to

Resynch Requests, acknowledging received guaranteed frames and resending frames that

have not been acknowledged will provide a control interface that is robust. You will not

have to tell your customer “if it didn’t work, just hit the control button again to resend the

command….”.

Many times, however, a simple open loop message system is adequate for the application.

This quick start guide will allow you to control some common parameters in the

DriveRack series of products using the “canned” strings provided below. This guide is

not intended to replace the “Full Duplex Network and Data Link Layer

Specification”, but is intended to help send a few commands to a DriveRack to get

started working on a control application.

Baud Rate: 38.4 kbps, 8N1

Reysnc:

Whenever the controller begins operation, resynch to the DriveRack. This ensures that

the communications protocol is flushed and ready to receive a message frame.

First send 16 <0xff> characters to the DriveRack.

Then send 261 <0xf0> characters to the DriveRack.

Now as long as the controller sends valid frames, the controller and DriveRack will stay

in Synch.

Ping:

If a ping is received <0x8c>, send a ping back <0x8c>.

The Message Frame:

The commands to the frame is an SDLC packet frame. The packet frame for a Data

Gram is as follows.

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Controlling DriveRack™ products with RS-232: A quick start guide. If you are using an AMX panel with a NetLinx control module, you are in luck. Ther

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<Dest><Src><Length><data[Length]><CCIT byte> note: there must be at least one byte in the data section. A length of z

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A function to calculate the ccitt value can be implemented in ‘C’ as: UCHAR update_bcc(UCHAR current_bcc, UCHAR new_value) { return Network_CCITT_8

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Source Select: If a 400 series DriveRack is configured with channels 1,2,3,4 as input mixers, these mixers can be used as a source select. For a ster

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