What It Does - Harman Kardon AVR 325 Instructions Manual

AVR 325/525/7200: RS-232 Port Instructions
Version 1.1 - Revised 6-Jan-2003

What it does

Harman Kardon's AVR 7200, AVR 525 and AVR 325 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 control system or computer will mimic the operation of the standard remote control,
and the AVR will respond accordingly.
The operation of the system is one-way, so it is important to provide some means of
observing the AVR's operation through either the front panel display, the on-screen
messages generated by the AVR, or by visual/aural observation of the command's
impact on the system. As the system is one-way only, no acknowledgements are
provided back to the control system or computer by the AVR.
Connection
The connection between the control device or computer and the AVR is via a two-wire
connection using standard DB-9 connections. The AVRs are not compatible with USB
type 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.
IMPORTANT NOTE: It is important that a standard "straight through" connection cable be
used. DO NOT use a "null modem" cable, as is the case for other similar products. Since
the AVRs internally cross over the pin connections, and the use of a null modem cable
will render the system inoperable.
RS-232 Settings
The following settings should be made to the host (transmitting) device:
Baud Rate : 4800 bps
Data Bits : 8
Parity : No
Stop Bit : 1
Flow Control : No (off)
Command Acceptance Time: 108 ms.
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