The CP2102 has additional control I/O to support RS-232 signalling.

RS-485 Converter
SKU Chipset Input Type Interface Stock Status Price (Excl.)
102493 CP2102 USB TTL: RS-232,RS-485 Back-order
102494 PL2303HX USB TTL: RS-485 Back-order
102493 102494
DC To DC Converter
SKU Input Voltage Output Voltage Rated Power Stock Status Price (Excl.)
101495 3.2-40VDCV 1.25~35VDC AdjustableV 60.00W Back-order
101594 4-40VDCV 1.25~37VDC AdjustableV 60.00W Back-order
 101594 With Voltmeter  101495