Solution:

The following comparison between ADAM-4510 and ADAM-4510S is for your reference: A: Same 1. Repeater: RS-422, 485 <==> RS-422, 485 2. Baudrate: 1200 - 115.2K bps 3. RS-485 control: Auto 4. RS-422 control: Always on, Auto ( switchable ) 5. Data format: 9, 10, 11, 12 bits 6. Power requirement: Unregulated +10 to +30 Volts 7. Power ripple: 200mV peak to peak 8. 12VDC surge protection and 170 mA overcurrent protection B: Difference 1. Isolation: 4510S provides 3000VDC isolation, but not for 4510.