Trouble communicating with Bluegiga WT-32 breakout

Wireless & IoT
1

I recently bought a [Bluegiga WT-32 breakout to experiment with. Unfortunately, I’m having some difficulty in actually talking to it.

I also have a [FT232RL breakout which I’m trying to connect to it. I have:

FT232RL 3.3V → WT-32 VCC

FT232RL GND → WT-32 GND

FT232RL RX-I → WT-32 TX0 (‘zero’ and not the letter ‘O’?)

FT232RL TX-O → WT-32 RXI

FT232RL CTS → WT-32 RTS

FT232RL RTS → WT-32 CTS

FT232RL GND → WT-32 RESET

I’m connecting to the serial port at 115200,8N1 as the iWRAP documentation suggests.

I’ve also tried disabling hardware flow control by grounding CTS and leaving RTS floating (again, as per documentation), on the off chance that I didn’t have the flow-control settings correct, but that doesn’t seem to help.

With only GND and 3.3V connected, I measure the following voltages:

CS - 1.87V

AIO0/1 - 0.19V

USBD+ - 3.28V

TXI - 1.86V

RTS - 1.88V

VCC - 3.36V

Have I mistakenly connected something incorrectly? Are there any other recommended debugging steps? Do I possibly have a faulty module?](SparkFun USB to Serial Breakout - FT232RL - BOB-12731 - SparkFun Electronics)](Bluetooth Breakout - Bluegiga WT-32 - WRL-08952 - SparkFun Electronics)

2

Aha, I had missed that BTEN has to be high to enable the voltage regulator; I can now talk to the module in a serial terminal. Yay.