HP Xp8010 series Service manual

1 1

xp8010 series

digital projector

rs232 protocol reference

RS-232 protocol reference

Notice

This manual and any examples contained herein are provided “as is” and are subject to change

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Hewlett-Packard Company

Digital Projection and Imaging

1000 NE Circle Blvd.

Corvallis, OR 97330

Edition 2 (July 2003)

RS-232 protocol reference

Contents

RS-232 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Cable connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Communication settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

RS-232 protocol syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Requests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Notifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

RS-232 keyword listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Changing input sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

RS-232 protocol reference

RS-232 Protocol Reference

RS-232 connections

This guide describes how to configure the projector for RS-232 communication with

an external controller, and describes the RS-232 command keywords used to send

requests to the projector.

Cable connections

Use an RS-232 cable to connect a controller to the projector’s D-sub 9-pin connector.

The table below lists the connector’s pin outputs.

✎When connecting a computer to the projector, use a null-modem cable.

Communication settings

Make sure the controller device uses the following settings for RS-232

communication with the projector.

❏9600 baud

❏1 start bit + 8 data bits (D0 = LSB, D7 = MSB) + 1 stop bit

❏no parity

❏full duplex communication channels (no flow control)

❏no handshaking

D-Sub 9-Pin Connection

Pin Signal Direction

3 TxD data from projector to controller

2 RxD data from controller to projector

5GND —

RS-232 protocol reference

RS-232 protocol syntax

The following describes the general elements of RS-232 protocol syntax. For details

about a specific keyword, refer to the “RS-232 keyword listing” on page 10.

✎This manual uses the symbols “<CR>” and “<LF>” to represent a carriage return and

line feed, respectively.

Requests

Commands are sent to the projector as “requests,” which consist of an asterisk (*)

prefix, a command keyword, any needed parameter, and a carriage return <CR> as a

terminator:

* keyword = parameter <CR>

Requests can contain only ASCII alphanumeric characters. Blanks (spaces) are

allowed, except within keywords and numbers. Line feeds <LF> are ignored.

The following table shows the specific syntax to use for various requested tasks.

Some requests to modify a particular setting also modify other related settings. For

example, a request to modify the active input source might also modify settings such

as brightness or white intensity to suit the new source. This and other requests can

produce delayed (asynchronous) notifications — see page 9 for examples.

To perform this task... Use this request syntax

Change a setting to a specified value *keyword=value<CR>

Query a setting *keyword=?<CR>

Increment a setting *keyword=+<CR>

Decrement a setting *keyword=–<CR>

Invoke an action (no parameter needed) *keyword<CR>

RS-232 protocol reference

Notifications

In general, every request sent to the projector generates one or more notification

messages, which are sent to the controller. (The exception is unrecognized requests,

which are ignored.) Actions initiated by the projector can also generate notifications.

The projector is always in verbose mode, and sends notifications whenever a setting

changes, whether as the result of a request from a controller, or as the result of an

action such as a button press or menu change. Some requested setting changes take

time to accomplish, or are carried out in stages: because of this, these requests may

produce asynchronous notifications.

A given request may produce more than one notification. An example of this is a

request to change the active input source: the initial request produces a notification

acknowledging the request, and also produces delayed notifications indicating that

related settings were changed. See page 9 for examples.

The following table lists the types of notifications generated in various situations.

This type of request... Generates this type of notification

Modify a setting Echoes the request keyword and shows the

resulting value:

Request: *BRT=65<CR>

Notification: *BRT=65<CR><LF>

Query a setting Echoes the request keyword and shows the

resulting value:

Request: *CON=?<CR>

Notification: *CON=40<CR><LF>

Execute an action Echoes the request keyword:

Request: *NXT<CR>

Notification: *NXT<CR><LF>

RS-232 protocol reference

The following table illustrates the types of notifications that can result if a request uses

incorrect syntax.

This incorrect syntax... Generates this type of notification

No asterisk at start of request None:

Request: PMOD=1<CR>

Notification:

Unrecognized keyword None:

Request: *BTR=65<CR>

Notification:

Invalid parameter Echoes the request keyword with the current

value:

Request: *BRT=–65<CR>

Notification: *BRT=10<CR><LF>

Specifies an action with an

unnecessary parameter

Ignores the parameter, executes the request

keyword, and echoes the keyword:

Request: *SYNC=65<CR>

Notification: *SYNC<CR><LF>

Requests a valid setting that is

unavailable (for example, due to

lack of an input source, or to the

setting not being supported for the

input source)

Echoes the request keyword, with a question

mark instead of a value:

Request: *CSPC=0<CR>

Notification: *CSPC=?<CR><LF>

Attempts to increment/decrement a

setting past its defined limits.

Ignores the request, and echoes the keyword

with the current value for the setting. For

example, if BRT is set to 100 (its maximum):

Request: *BRT=+<CR>

Notification: *BRT=100<CR><LF>

Attempts to modify a read-only

setting.

Ignores the request, and echoes the keyword

with the current value for the setting:

Request: *STAT=3<CR>

Notification: *STAT=1<CR><LF>

RS-232 protocol reference

Example — changing input source

The following simplified example shows how the projector typically responds to a

request to change the active input source. Note that the three latter notifications are

delayed.

Request: *RSRC=2<CR>

Notifications: *RSRC=2<CR><LF> (acknowledges request)

*SRC=0<CR><LF> (projector is attempting to

acquire source 2, and in the

interim has no valid source)

*SRC=2<CR><LF> (source 2 has been acquired

and is now active)

*BRT=50<CR><LF> (brightness has been modified

for source 2)

*CSPC=?<CR><LF> (color space is not supported

for this input)

Example — changing the picture mode

A request to change the picture mode can take a moment to complete, and so produces

a delayed notification. In this example, the picture mode is initially set to 0.

Request: *PMOD=1<CR>

Notifications: *PMOD=0<CR><LF> (current setting)

*PMOD=1<CR><LF> (new mode is active)

Example — turning on the projector

Request: *STAT=?<CR>

Notification: *STAT=0<CR><LF> (current setting)

Request: *W<CR>

Notifications: *W<CR><LF> (echoes request)

*STAT=2<CR><LF> (projector enters its warm-up

state)

*STAT=1<CR><LF> (projector enters its on state)

RS-232 protocol reference

RS-232 keyword listing

The following table shows the RS-232 keywords supported by the projector.

If the parameter listing for a particular keyword is “None,” that keyword requires no

parameter.

✎Except as noted in the keyword listing, each keyword is valid only when the projector

is in its on state, STAT=1 (and not warm-up, cool-down, or standby state).

RS-232 keyword listing

Keyword Parameters Description

Source functions

SRC ? Queries the current active input source:

• 0 = no active source

•1=VGA1

•2=VGA2

•3=compositevideo

•4=S-video

• 5 = component video

YPbPr

•6=RGBHV

• 7 = M1 graphics

RSRC 1 to 7, ? Attempts to use the specified source as the active input

source, or queries the last source requested:

•1=VGA1

•2=VGA2

•3=compositevideo

•4=S-video

• 5 = component video

YPbPr

•6=RGBHV

• 7 = M1 graphics

If the requested source is not available and AUTO is

enabled, the projector scans for the next valid source; if

AUTO is disabled, the projector returns the notification

*SRC=0.

NXT None Searches for the next input source.

AUTO 0 to 1, ? Queries or sets input source auto-search: 0 = disabled,

1=enabled

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