The datasheet suggests using GPIO0 and GPIO1 to control them - GPIO's can be set to the TXstate and RXstate for instance or directly controlled via SPI. Its worth checking which modules have a switch (I'm suspecting its 22's and not 23's but I don't really trust the datasheets as they seem to cover the silicon only with module information as an afterthought)
Have you seen a 22B or 23B BTW?