ATU Command, How to Structure?

I am not clear on how to use the "atu start" and the "atu bypass" API commands.

The wiki shows the command structure as "<pre>C14|atu start</pre>", and explains, "there must be a slice designated as the transmitter and the radio transmit state must be READY".

The question is, how can I structure a command to use the Flex internal ATU?

Below is a log of my attempt, but as you can see, it failed.

Alan. WA9WUD

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Radio[1]._sendRequest(C5|atu start)

Radio[1]._receiveMessage(R5|0|)

Radio[1]._receiveMessage(S0|interlock tx_client_handle=0x00000000 state=NOT_READY reason= source= tx_allowed=0 amplifier=)

Radio[1]._receiveMessage(S0|interlock tx_client_handle=0x00000000 state=READY reason= source= tx_allowed=1 amplifier=)

Radio[1]._receiveMessage(S516A56AE|interlock acc_txreq_enable=0 rca_txreq_enable=1 acc_tx_enabled=0 tx1_enabled=1 tx2_enabled=0 tx3_enabled=0 tx_delay=30 acc_tx_delay=0 tx1_delay=0 tx2_delay=0 tx3_delay=0 acc_txreq_polarity=0 rca_txreq_polarity=0 timeout=300000)

Radio[1]._receiveMessage(S0|interlock tx_client_handle=0x62F85ACA state=NOT_READY reason= source= tx_allowed=0 amplifier=)

Radio[1]._receiveMessage(S516A56AE|interlock acc_txreq_enable=0 rca_txreq_enable=1 acc_tx_enabled=0 tx1_enabled=1 tx2_enabled=0 tx3_enabled=0 tx_delay=30 acc_tx_delay=0 tx1_delay=0 tx2_delay=0 tx3_delay=0 acc_txreq_polarity=0 rca_txreq_polarity=0 timeout=300000)

Radio[1]._receiveMessage(M31000003|Interlock is preventing transmission)

Radio[1]._receiveMessage(M31000003|Interlock is preventing transmission)

Radio[1]._receiveMessage(S0|interlock tx_client_handle=0x00000000 state=READY reason= source= tx_allowed=1 amplifier=)

Radio[1]._receiveMessage(S0|interlock tx_client_handle=0x00000000 state=READY reason= source= tx_allowed=1 amplifier=)