How do Sealevel synchronous serial adapters handle Manchester clock encoded data?

Manchester clock encoding (also known as split phase or bi-phase level encoding) always produces a transition at the center of the bit cell.

Sealevel synchronous serial adapters with the Zilog Z85230 chipset family can receive Manchester encoded data, but cannot transmit it.

Sealevel synchronous serial adapters with the Zilog Z16C32 chipset can both receive and transmit Manchester encoded data.