SPECIFICATIONS

Application: Computer

Brand Name: Jessinie

Condition: New

Dissipation Power: Low

High-concerned chemical: none

Operating Temperature: Normal

Origin: Mainland China

Package: TQFP

Supply Voltage: Standard

Type: Module

is_customized: Yes

TTL to RS485 Blue
*This module fully considers the 485 bus lightning protection and anti-interference design. For long-distance transmission outdoors, connecting the module's "ground" terminal to the ground provides excellent interference and lightning protection, ensuring a safer 485 bus. For short-distance transmission indoors, ground connection is not required.
* 120 ohm matching resistor. Shorting R13 enables the matching resistor. Shorting this resistor is recommended for long-distance transmission.
* Supports multi-device communication, allowing connection to a bus with up to 128 devices.
* This module is hot-swappable without signal deadlock.
* Large copper surface area prevents signal interference.
* RXD and TXD signal indicators provide convenient visibility of data transmission and reception.
* Transmission distances up to 1,000 meters (tested using 850m 2x1.5mm cable. Recommended use is within 800 meters. For distances exceeding 800 meters, use a repeater.)
* Utilizing a semi-hole design with a thickness of 0.8mm, it can be easily used as a motherboard or daughterboard, or with solder terminals.

TTL to RS485 Red
* Ultra-long-distance transmission of up to 1,000 meters. * ESD protection up to 15kV (positive and negative)
* Dual transient suppression diodes for excellent overvoltage protection
* Surface-mount tantalum electrolytic capacitors are used for the power supply, with dual capacitors for high and low frequency power filtering
* 10Ω current protection resistors, with a surface-mount design, enhance 485 signal integrity
* This module is hot-swappable and prevents signal deadlock
* Terminals and solder leads facilitate debugging and final wiring, with solder leads improving signal reliability
* The chip features a slew-rate-limited driver to reduce EMI and signal reflections caused by improperly terminated cables, enabling error-free signal transmission rates of up to 500kbps
* Receiver input impedance of 1/4 unit load supports multi-device communication and allows connection to a bus with no more than 128 devices
* Large copper area prevents signal interference
* 120Ω matching resistors are included; shorting R0 enables the matching resistor. Shorting is recommended for long-distance transmission
* RXD and TXD signal indicators provide convenient visibility of data transmission and reception

RS485 Wide Voltage
*This module fully incorporates lightning protection and anti-interference design for the 485 bus. For long-distance transmission outdoors, connecting the module's "ground" terminal to the ground provides excellent interference and lightning protection, ensuring a safer 485 bus. For short-distance transmission indoors, ground connection is not required.
*Equipped with a 120 ohm matching resistor. Shorting R0 enables the matching resistor. Shorting this resistor is recommended for long-distance transmission.
*Equipped with RXD and TXD signal indicators for convenient monitoring of data transmission and reception.

TTL-to-485 loopback test (tests module data transmission and reception) (This test requires two USB-to-TTL modules and two TTL-to-485 modules):
1. Connect the two USB-to-TTL modules and two TTL-to-485 modules as shown in the diagram below.
Note: For some modules, the RX and TX pins of the USB-to-TTL and TTL-to-485 modules do not need to be reversed.
2. On a computer, use two serial port assistants to open the ports identified by the device manager.
3. Send data in one transmit window and check in the other receive window to see if the same data is being received.
4. If the data sent and received by the two modules are the same, the modules are transmitting and receiving data normally.