The DIN RS485 board / module from L&R Ing. (Figure 1) contains a user-configurable circuit which allows it to be used in three different data communication systems. It can serve a) as a bridge between an RS-485 network and an RS232 port, b) between a conventional serial TTL (RxD/TxD 5V) port and RS485 (with Auto-Enable or external Enable TTL signal), or c) between the same 5V TTL port and an RS232 port, with only Rx and Tx signals. These configurations are set by jumpers JP1 on the board. A low-dropout LM2937-5 regulator supplies power for the circuit from an external source between 7 and 25 Vdc, power draw typically 0.05 A @ 12 Vdc. Can be provided as bare board or with DIN rail mounting. High quality FR4 board manufactured at Mayer and AE / Argentina with US-sourced components. Circuit diagram provided in User Guide.

User guide (English - PDF): RS485DIN UserGuide 2021

 

Figure 1 DIN RS485 board L&R Ing.