I-7520A with 3000V DC isolation at RS-485 side

Features 
Input : RS-232 protocol
Output : RS-485/RS-422 protocol
Speed : auto switching baud rate, 300~115200 bps
"Self Tuner" inside, 
256 modules max. in one RS-485 network without repeater
2048 modules max. in one RS-485 network with repeater
Isolation voltage: 3000Vdc at RS-485/422 side
Repeater request: 4,000 feet or over 256 modules
Input power : 10Vdc ~ 30Vdc
Power consumption: 2.2W max.

Manual