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ELM624P PDF预览

ELM624P

更新时间: 2024-10-30 10:07:59
品牌 Logo 应用领域
ELM /
页数 文件大小 规格书
7页 47K
描述
CONTROL L TO RS232 INTERPRETER

ELM624P 数据手册

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ELM624  
Control L to RS232 Interpreter  
Description  
Features  
The Control L or LANC interface is an industry  
• Low power CMOS design  
standard for many audio and video devices. It uses a  
bit serial format that is similar to RS232, but differs  
enough that devices cannot be directly connected to  
one another. The ELM624 provides the necessary  
logic to allow almost transparent transfer between  
the two systems.  
• High speed RS232 communications  
• Configurable with standard AT commands  
• ASCII output formatted as standard hex digits  
• Minimum of external components required  
• Most Control L formats supported  
In operation, commands are sent to the ELM624  
using an RS232 serial connection, translated to the  
Control L format, and sent to the controlled device  
on the LANC port. The resulting responses are then  
converted to a series of ASCII characters and  
transmitted back to the controlling serial device.  
• External reset input for system use  
• Crystal controlled for signal accuracy  
This integrated circuit was designed to provide a  
cost-effective way for experimenters to work with the  
Control L system, so 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 are demonstrated, and for many  
applications, this is all that is required.  
Connection Diagram  
PDIP and SOIC  
(top view)  
1
2
3
4
8
7
6
5
VDD  
XT1  
VSS  
LANC  
Tx  
XT2  
Applications  
reset  
Rx  
• Video editors  
• Time-lapse recording controllers  
• Remote camera controls  
• Computer control of A/V equipment  
VDD  
Block Diagram  
7
LANC  
Control L  
Interface  
XT1  
VSS  
2
Master  
Control  
XT2  
Oscillator  
3.58MHz  
3
6
5
Tx  
RS232  
Interface  
VDD  
Rx  
4
reset  
ELM624DSB  
Elm Electronics – Circuits for the Hobbyist  
1 of 7  
< http://www.elmelectronics.com/ >  

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