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TTL TO RS422 (B) is an industrial-grade rail-mounted electrically isolated TTL-to-RS485 serial converter.
Model | Galvanic isolated TTL to RS422 converter | |
---|---|---|
Power Port | Power Supply | 3.3V ~ 5V |
Interface Protection | anti-over-discharge, reverse-proof | |
Device Interface | Compatible with TTL / RS485 standard | |
TTL Interface | Interface Type | Screw terminal |
Transmission Distance | less than 10m | |
Transmission Model | Point to point | |
RS422 Interface | Interface type | Screw terminal |
Interface Protection | Provide 600W lightningproof, surge-suppress and 15KV ESD protection | |
Terminal Resistance | 120R, enabled/disabled via jumper (inside the case) | |
Transmission Distance | About 1200m | |
Transmission Mode | Point-to-multipoint (Up to 32 nodes can be connected, and relays are recommended for more than 16 nodes) | |
Product Appearance | Case | Rail-mount ABS case, suitable for 35mm DIN rail |
Dimensions | 91.6 × 58.7 × 23.3mm |
Convert TTL signal to balanced differential RS422 signal, which can be used for interface conversion, and node expansion, and can also be used to extend the communication distance.
* Note: the TTL TO RS422 (B) is designed to be used with RS422 devices, however, it is also possible to be used with RS485 devices (yet only sending is available). It is recommended to use TTL TO RS485 (B).
Test Environment: PC (Windows).
Accessories required for testing:
The RS422 interface of TTL TO RS422 (B) is connected to the PC with the USB to RS422 conversion cable. The TTL interface of TTL TO RS422 (B) is connected with the TTL of USB TO TTL. The USB port of USB TO TTL is connected to the same PC for the self-receiving tests. The schematic diagram of the hardware connection is as follows:
Note: The RS422 interface of this product also has two built-in 120R enabling resistors, which are enabled by default. Users can remove the case to modify the settings according to their needs. If signal isolation is required, GND can also be connected to the ground wire.
On the PC, open two SSCOM serial port debugging assistants, open the corresponding port number, set the same baud rate, and click Send at regular intervals to send and receive normally. The screenshot of the software test is as follows: