Runco DTV-873 manual Appendix, RS 232 Control

APPENDIX 1

RS 232 Control

By far, the most accurate way to control or integrate the DTV-873 into a home theater system is by RS 232 control. In this section, you will find hardware configuration and how to format the control data, command strings and examples.

Hardware Configuration

RS232 Connector 9PIN D-SUB PC-AT TYPE. Projector has female type.

To establish communications with the projector, the following conditions must be made:

			3	3	TXD
Recommended		TXD
			2	2		Projector
Pin to Pin		CTS			+9V
Method	PC	RXD	5	5	RXD
		GND			GND
			8	8
All 9 Pins			6	6	+9V
		DSR

NOTE: All wires are straight through. DO NOT cross PINS 2 to 3 as in a null modem configuration.

Alternatively, the connections can be made as follows (absolute minimum of wires):

			3		3	TXD
No Flow Control		TXD
			2		2		Projector
4,6,8 at PC		CTS				+9V
				Tied together
		RXD	5		5	RXD
Jump Pins	PC	GND	8			GND
side			6	at computer		+9V
		DSR
			4
		DTR

PIN OUTS FOR 9 PIN

1: CD Carrier Detect

2:RXD Receive Data

3:	TXD	Transmit Data
4:	DTR	Data Term Ready

5:GND Signal Ground

6:	DSR	Data Set Ready
7:	RTS	Request To Send
8:	CTS	Clear To Send

9:Ring Indicator

The Protocol Necessary For Communications:

8 Data Bits, No Parity, 1 Stop Bit

Baud Rate is selectable between 8 rates at the projector up to 9600 Baud (9600 is default).

NOTE: Some automation systems may only use/require pins 3, 2, 5 be connected.

How to format the control data

Every command sent to the projector is a group of 9 bytes that is called a record. Even a simple ON command is sent as a record. Below is an explanation of the syn- tax of a record. It is not necessary to memorize the syntax since the next section contains a chart of strings that work with any DTV-873 and can be entered directly into most automation systems to control all the functions of the projector.

APP-1