Sony HR Trinitron PVM-20M7MDE Interface Manual For Programmers

3-810-592-11 (1)

Trinitron



Color V ideo Monitor

Interface Manual for Programmers

Before operating the unit, please read this manual
thoroughly and retain it for future reference.

PVM-20M7MDE

 1995 by Sony Corporation

Table of Contents

Introduction ..............................................................................................3

Controlling the Color Video Monitor...............................................3

RS-232C Main Control Functions....................................................3

Communication via the RS-232C Interface ...........................................3

Connector Pin Assignment...............................................................3

Communication Parameters .............................................................3

Command Block Format ..................................................................4

Communication Protocol..................................................................4

Starting Up the Monitor ...................................................................4

Control Commands ..................................................................................5

Command Table ...............................................................................5

Command Description .............................................................................6

Input Config (21H)...........................................................................6

On Switch Function (29H) ...............................................................6

Off Switch Function (2AH)..............................................................7

Select Display (2BH) .......................................................................7

Select RGB Mode (2FH)..................................................................7

White Balance Data (40H) ...............................................................8

NV RAM Save (45H)....................................................................... 8

Sub Control Data (4CH)...................................................................9

Landing Data (4DH).........................................................................9

Reset Data (4EH) .............................................................................9

Input Config Sense (60H) ..............................................................10

White Balance Sense (61H) ...........................................................10

Sub Control Sense (6BH)...............................................................10

Landing Sense (6CH) .....................................................................10

Status Sense (6DH) ........................................................................10

Status Remote (6EH)......................................................................10

Input Config Reply (70H) .............................................................. 11

White Balance Reply (71H) ...........................................................11

Sub Control Reply (7BH)...............................................................11

Landing Reply (7CH).....................................................................11

Status Reply (7DH) ........................................................................11

Status Remote Reply (7EH) .............................................Back cover

ACK Reply (04H) ............................................................Back cover

NAK Reply (05H) ............................................................Back cover

2

Communication via the

Introduction

Controlling the Color Video Monitor

The color video monitor can be controlled in two
ways:

• Control from the operation panel of the monitor

• Control from the externally connected computer via
the RS-232C interface.

This interface manual explains the control method via
the RS-232C interface. For details on control from the
operation panel of the monitor, refer to the instruction
manual supplied with the color video monitor.

RS-232C Main Control Functions

This serial protocol provides the following features
when individual monitors are controlled via the RS­232C interface.

• Parameters of the monitor can be changed without
changing the nonvolatile RAM settings.
These parameters include using sub controls to
adjust volume, contrast, aperture, brightness and
chroma, white balance, landing data and input
configuration.

• All functions that are available with the switches on
the monitor’s operation panel can be changed
remotely.

• Settings and adjustments normally made with the
monitor’s on-screen menu can be made remotely.

• The current monitor’s parameters can be saved into
nonvolatile RAM.

• Status information can be got from the monitor by
sending the Sense commands.

RS-232C Interface

Connector Pin Assignment

The RS-232C connector is on the back of the monitor.
The signal assignment for the monitor are shown in the
table below.

Connector pin assignment

Pin number

1
2

3

4
5
6
7
8
9

Communication Parameters

Communication parameters should be set as follows.
Transmission mode : Asynchronous, bit

Data communication baud rate : 9600 bps
Parity: : Even
Stop bit length : 1
Transfer sequence : Transmission from

Signal

Unused
RX

(Monitor M Computer)
TX

(Monitor m Computer)
Unused
GND
Unused
Unused
Unused
TALLY ON/OFF

serial signal

lowest bit (LSB)

Contents

Receive Data

Transmit Data

Signal Ground

The bit composition is as follows:
1 start bit + 8 DATA bits + 1 PARITY bit + 1 STOP
bit

1
(Mark)

Start

Bit 0

bit

Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7

(LSB)

(MSB)

Parity

bit

Stop

bit

0
(Space)

3

Communication via the RS-232C Interface

Command Block Format

Data is sent between the computer and the monitor in
the following format.

STX Byte

1 byte 1 byte 1 byte 1 byte n bytes 1 byte

STX

Start of text code value: 02H (the suffix “H” indicates
a hexadecimal (16) number)

Byte Count

This indicates the number of data bytes (maximum 255
bytes) which have been inserted between this byte and
the checksum byte.
Values 00H, 01H and 02H are illegal values.

Destination address

One byte address value which defines where data
composed of the above format is transmitted to. Value
02H should be specified when the command is sent
from the computer to the monitor.

count

Destination

address

Source

address

Command block

Checksum

computer, it sends back the following responses
corresponding to the commands sent from the
computer within 9 milliseconds of receiving the
commands.

• NAK (05H)
When the received command is an undefined
command or a communication error occurs.

• Specific Code + DATA
When the received command is a question requiring
a reply.

• ACK
When the received command is anything other than
the above two.

The remote control should not issue any other
commands until the response has been received from
the monitor.
The remote control should not leave a gap between
bytes to be transmitted of more than ten milliseconds.
Otherwise the monitor will treat the message as
received in error.
If the remote control unit receives a NAK from the
monitor it must wait more than ten milliseconds before
transmitting any more messages.

Source address

One byte address which defines where the data was
sent from. This defines where the response
corresponding to commands sent will be returned
from. Values from 41H to 7FH should be specified.
when the command is sent from the computer to the
monitor.

Command block

This designates a particular command.

For detailed information, see “Command Description” on
page 6.

Checksum

This value is set to make the lower eight bits of the
sum of all bytes from the Byte Count to the Checksum
inclusive zero.

Communication Protocol

The computer takes the initiative in communication
between the computer and the monitor.
When the monitor receives a command from the

4

Starting Up the Monitor

To start up the monitor, proceed as follows.

1 Connect the serial cable to the RS-232C connector

on the back of the monitor and connect the other
end to the computer.

2 Turn on the power on the monitor.
3 Turn on the power on the computer.
4 Set the serial parameters for the computer’s RS-

232C interface.

The monitor can then be controlled from the computer.
It can also be controlled from the operation panel of
the monitor. The monitor is factory-set to LOCAL
mode. In this mode, the monitor cannot be controlled
from the computer. You should set the monitor to
REMOTE (FRONT LOCK) or REMOTE & LOCAL
mode to control the monitor from the computer using
the monitor’s on-screen menu.

For detailed information on how to select REMOTE or
REMOTE & LOCAL mode, refer to the instruction manual
supplied with the monitor.