Harman kardon AVR 430, AVR 230, AVR 635, AVR 435, AVR 630 RS-232 Port Instructions And Code Listing

Harman Kardon AVR Series Receivers

RS-232 Port Instructions

And Code Listing

Harman Kardon AVR Products RS-232 Code Programming Information

Version 1.0 ~ 14-November-05

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1.0 Applicable Products

This document contains the technical information needed to connect Harman Kardon AVR
series receivers equipped with bi-direction RS-232 control capability to a computer or other
compatible specialized control devices with RS-232 communications capability for control
and feedback of the receiver. The current Harman Kardon products with this capability are
the AVR 635, AVR 630, AVR 435 and AVR 430.

The remote codes listed in this document may be used to control any Harman Kardon AVR
or DPR model product equipped with and RS-232 port, but only the models listed above
allow for two-way communication. All other products are one-way only.

2.0 Control Capabilities

Applicable Harman Kardon’s AVR products listed above are designed for operation in
conjunction with remote keypad, computer or other control devices capable of sending
compatible hexadecimal data through an RS-232 connection. The commands issued by
the computer or control system will mimic the operation of the standard remote control,
and the AVR will respond accordingly. This document describes the connections between
the devices and their interaction.

The control data is sent from the PC or control device to the AVR using commands issued
using either a PC Keyboard or Mouse or a touch screen controller and data from the AVR
with its status may be displayed on the PC or interpreted for touch screen display.

Harman Kardon AVR Products RS-232 Code Programming Information

Version 1.0 ~ 14-November-05

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3.0 Connections and Settings

3.1 Connections

The connection between the computer and the AVR is via a two-wire connection using
standard DB-9 connections.

The connections should be made directly (“straight through”) from pin 3 (TxD) to pin 3, and
from pin 5 (GND) to pin 5. No other connections are needed, although a standard serial
connection cable with all pins connected may be used.

IMORTANT NOTE: It is essential that a standard “straight through” connection cable
be used. DO NOT use a “null modem” cable. Since the AVR cross over the pin
connections internally, the use of null modem cable will render RS-232 control
system inoperable.

3.2 RS-232 Settings

The following settings should be made on PC or control device:

Baud Rate: 38,400 bps
Data Bits: 8
Parity: No
Stop Bit: 1
Flow Control: No (off)
Command Acceptance Time: 50 ms

4.0 Data Communication Format

4.1. Transmission

Transmission Data Type Length Information Field Check Sum

Transmission recognition code is 6 bytes long ASCII code and it is used to make a
distinction between AVR Control Data being sent from PC to AVR or AVR status Data
coming from AVR to be displayed on PC. Following codes are used for this purpose:

“PCSEND”(ASCII) AVR Control Data (PC to AVR) using PC Keyboard or Mouse
“MPSEND”(ASCII) Data for AVR Status Display on PC (AVR to PC)

Harman Kardon AVR Products RS-232 Code Programming Information

Version 1.0 ~ 14-November-05

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4.2 Data Type

Transmission Data Type Length Information Field Check Sum

Data Type field is a one byte long and distinguishes between different types of data being
used in protocol as explained in the following table:

Purpose Direction Value

DSP UPGRADE PC  AVR 1

PC Remote Controller PC  AVR 2

CPU UPGRADE PC  AVR 4

Send Data from AVR AVR  PC 3

4.3 Data Length

Transmission Data Type Length Information Field Check Sum

Length field is one byte long and represents length of information field. As information field
is variable depending on direction of data transfer, this field is necessary. Length field
value will be 4 if Remote Control through PC to AVR is used and the value will be 48 if
AVR status display on PC is desired.

4.4 Information Field

Transmission Data Type Length Information Field Check Sum

Information field is hex code data of either four-byte command from PC to AVR or 48-byte
hex code for AVR status display on PC. We explain both of them in detail in the following
sections:

Harman Kardon AVR Products RS-232 Code Programming Information

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