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ELM624 데이터시트 PDF




ELM Electronics에서 제조한 전자 부품 ELM624은 전자 산업 및 응용 분야에서
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부품번호 ELM624 기능
기능 Control L (LANC) to RS232 Interpreter
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ELM624 데이터시트, 핀배열, 회로
ELM624
Control L (LANC) to RS232 Interpreter
Description
The Control L or LANC interface is an industry
standard introduced by the Sony Corporation for
controlling audio and video devices. It uses a bit
serial data format, and requires that the controller be
synchronized to the controlled device – something
which is difficult to do using standard serial
interfaces. The ELM624 is an 8 pin integrated circuit
that performs the synchronizing function for you.
All user interaction with the ELM624 is by
standard ASCII characters over an RS232 interface.
There is no special formatting required, other than
perhaps an understanding of the hexadecimal
numbering system, nor is there a need for a powerful
PC - virtually any model with a serial port will do.
Since the ELM624 was designed to provide a
cost-effective way for people to experiment with the
Control L system, many features typically found in
commercial devices, such as RS232 handshaking,
variable baud rates, extra buffering of signals, etc.
have not been implemented. Responses are kept to
a minimum as well (eg. a single question mark is
returned for a misunderstood command), but the
general principles of operation are demonstrated
and for many applications, this is all that is required.
Applications
www.DataSheeVt4idUe.coomeditors
• Time-lapse recording controllers
• Programmed control of A/V equipment
• Remote camera controls
Features
• Low power CMOS design
• Enable input allows control of multiple devices
• Configurable with simple AT commands
• ASCII output formatted as standard hex digits
• Oscilloscope trigger pulse output
• Power control pulse output
• Crystal controlled for timing accuracy
• Works with 50 Hz and 60 Hz systems
• Power up to monitor mode
Connection Diagram
PDIP and SOIC
(top view)
VDD 1
XT1 2
XT2 3
Enable 4
8 VSS
7 LANC
6 Tx
5 Rx
Block Diagram
3.58MHz
XT1 2
3 XT2
VDD
Enable 4
Control
VDD
Rx 5
Tx 6
RS232
Interface
Control L
Interface
7 LANC
VSS
ELM624DSD
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM624 pdf, 반도체, 판매, 대치품
ELM624
Overview
The following describes how to use the ELM624 to
control, and to obtain information from your LANC
device. We begin by discussing just how to talk to the
IC, then how to adjust some options through the use of
‘AT’ commands, and finally go on to actually talk to the
LANC device, both obtaining status codes and sending
commands. For the more advanced experimenters,
there are also sections on how to use some of the
other features of this product as well.
For experimenting, all that is required is a PC or a
PDA with a terminal program (such as HyperTerminal
or ZTerm), and knowledge of one or two LANC
commands, which we provide in the following…
Communicating with the ELM624
The ELM624 relies on a standard RS232 type
serial connection to communicate with the user. The
data rate is fixed at 9600 baud, with 8 data bits, no
parity bit, 1 stop bit, and no handshaking (often
referred to as 9600 8N1). All responses from the IC
will be terminated with a single carriage return
character and by default, a line feed character as well.
Make sure that your software is configured for this type
of communication.
Properly connected and powered, the ELM624 will
initially display the message:
ELM624 v3.0
>
In addition to identifying the version of the IC,
receipt of this string is a convenient way to be sure
that the computer connections and the settings are
www.DatacSohrereetc4Ut..cHomowever, at this point no communications
have taken place with the LANC device, so the state of
that connection is still unknown.
The ‘>’ character displayed above is the ELM624’s
prompt character. It indicates that the device is in its
idle state, ready to receive characters on the RS232
port. Characters sent from the computer can either be
intended for the ELM624’s internal use, or for
reformatting and passing on to the LANC device.
Commands for the ELM624 are distinguished from
those to the LANC device by always beginning with
the characters ‘AT’ (as is common with modems),
while commands for the LANC bus must contain only
the ASCII characters for hexadecimal digits (0 to 9 and
A to F). This allows the ELM624 to quickly determine
where the received characters are to be directed.
Whether an ‘AT’ type internal command or a hex
string for the LANC bus, all messages to the ELM624
must be terminated with a carriage return character
(hex ‘0D’) before it will be acted upon. The one
exception is when an incomplete string is sent and no
carriage return appears. In this case, an internal timer
will automatically abort the incomplete message after
about 20 seconds, and the ELM624 will print a single
question mark to show that the input was not
understood (and was ignored).
Messages that are not understood by the ELM624
(syntax errors) will always be signalled by a single
question mark (‘?’). These include incomplete
messages, invalid hexadecimal digit strings, or
incorrect AT commands. It is not an indication of
whether or not the message was understood by the
LANC device. (The ELM624 is a protocol interpreter
that makes no attempt to assess LANC messages for
validity – it only ensures that either four or eight hex
digits were received, combined into bytes, and sent
out the LANC port. It cannot make judgement on the
actual bytes that were sent.)
Incomplete or misunderstood messages can also
occur if the controlling computer attempts to write to
the ELM624 before it is ready to accept the next
command (as there are no handshaking signals to
control the data flow). To avoid a data overrun, users
should always wait for the prompt character (‘>’)
before issuing the next command.
Finally, a few convenience items to note. The
ELM624 is not case-sensitive, so ‘ATZ’ is equivalent to
‘atz’, and to ‘AtZ’. Also, the device ignores space
characters as well as control characters (tab, linefeed,
etc.) in the input, so they can be inserted anywhere in
order to improve readability.
ELM624DSD
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM624 전자부품, 판매, 대치품
ELM624
AT Commands (cont’d)
be sent continually, until interrupted by the user.
Initially, the Control L/LANC standard required that
commands be repeated at least four consecutive
times to be valid (even though some machines
respond with less). The AT Rn command allows this
parameter to be adjusted as you experiment. The
default value for this setting is five (R5).
SP [ Send a Pulse ]
The power to some Control L/LANC devices can be
controlled by sending a short pulse on the LANC
data bus. When issued, the AT SP command sends
a 150msec wide pulse for this purpose. See the
Power Control section for more information.
TP n
[ Trigger Pulse output on word n ]
Selecting this mode causes a short, negative-going
pulse to be output on pin 6 at the beginning of the
LANC word/byte selected by ‘n’. These pulses will
continue to be sent until interrupted by the user, as
long as there are synchronizing pulses to lock to.
Allowable values of ‘n’ are from 0 to 7.
The output pulse width is nominally one bit wide at
9600 baud (104µsec), and is meant to be used for
triggering an oscilloscope or logic monitor, in order to
view word ‘n’ in more detail. Note that the RS232
transmit circuitry can remain connected while using
www.DataShtaheiesstt4aoUrp.tctoibomint ,foars
the short
a byte of
pulse
value
will simply be seen as
0xFF. Normal RS232
output is stopped while in this mode.
Z [ reset all ]
Sending AT Z causes the ELM624 to perform a
complete reset, as if power were turned off, and then
on again. All settings we be returned to their default
values, and the IC will be waiting for user input.
? [ status ? ]
Issuing this command causes the current status
bytes to be continually obtained from the LANC
device, without sending any command to it. This is
an alternate way to issue the Monitor All command,
and is functionally identical to it.
AT Command Summary
Figure 1 shows all of the ELM624 commands in one
convenient chart. In order to help with the
understanding of these, we have grouped the
commands into three functional areas, but this has
no bearing on how the commands should be used, it
is only for clarity. You may find this chart to be useful
when experimenting with the IC.
ELM624 AT Commands
general
2D use v2 Defaults
D use Default settings
I show the ID string
Z reset all
responses
C1/0 Show on Change
E1/0 Echo on/off
L1/0 Linefeeds on/off
FD use Formatted Data
Q1/0 Quiet mode on/off
RD use Raw Data
requests
CS Check for Sync
D1/0 Duplicate to w2/w3
MA Monitor All
Rn Repeat n times
SP Send (power) Pulse
TP n Trigger Pulse on n
? Monitor All
Figure 1. ELM624 v3.0 AT Commands
ELM624DSD
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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