اینترفیس RS422 برای
ارتباط سریال داده ها بصورت دیفرانسیلی و دو طرفه استفاده می شود. مزیت اصلی RS422 نسبت به RS485 قابلیت ارسال داده در فواصل طولانی دارد.
دو پین A و B بعنوان فرستنده و دو پین Y و Z به عنوان گیرنده عمل می کنند و برای حفظ اطمینان به صورت تفاضلی استفاده می شوند.
بر روی ماژول مبدل RS422 به TTL دیود حفاظتی TVS قرار دارد و برای کنترل جریان ورودی، مقاومت 10 اهمی در ورودی قرار داده شده و آی سی اصلی این مبدل SP3490 است.
Description:
RS422 interface, two-way communication. A B Y Z ultra far transmission 1000 meters. The module has ESD 15KV protection. On board to increase the limit of 10 ohm current limiting current protection. Module with TVS diode. Anti lightning peak voltage. The module has 120 ohm termination resistors, which can effectively reduce the interference of long range communication. Have the power indicator light and the data receiving and sending indicator light. Panoramic view of state data. Module TTL side using 3.3V DC power supply TXD RXD compatible with 3.3V logic signal. Module uses the original imported SP3490 chips, stability and communication speed is far more than domestic products, up to 25MBPS.
Application:
differential transmitting
Specifications:
Converter IC: SP3490
Supply voltage: 3.3 volts
main chip: MAX490 Module 4P terminal side:
VCC > +5V / +3.3V (module specification)
TXD > This module's TTL (UART) send, connected to the MCU's RXD receiving pin
RXD > This module's TTL (UART) receive pin is connected to the MCU's TXD send pin
GND > Ground wire of this module (this ground wire must be connected to the ground of the MCU system)
Module 5P terminal side:
R+/A > The A pin of this module needs to be connected to the T+/Y pin of other 422 modules
R-/B > The B pin of this module needs to be connected to the T-/Z pin of other 422 modules
T-/Z > The Z pin of this module needs to be connected to the R-/B pin of other 422 modules
T+/Y > The Y pin of this module needs to be connected to the R+/A pin of other 422 modules
GND > This is the ground wire of this module. If some conditions permit, the ground wire can be used as the return path of the common