Advantech PCM-3601 - Manual (Page 25)

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4.7 Display Dialing Number (if AT&In Command support) Option
$DTXAn n=0,1
n=0 Disable display Dialing number. (Default)
n=1 Enable display Dialing number.
A? Display Current status.
4.8 Auto Dial/Redial mode Option
&In n=0, 1, 2, 3
n=0 Disable auto dial/redial mode. (Default)
n=1 auto dial/redial &Z0.
n=2 auto dial/redial &Z0, &Z1, &Z2, &Z3.
n=3 auto dial/redial last dial number.