AT commands 59
P0873832 Issue 05
CTA 500
dm On Line Guide
DCD Operation
&Cvalue
The DCD Operation Command sets the operation of the DCD pin.
The following table shows the allowable values.
The DCD pin tracks the connection and asserts when the
CTA 500
dm
has successfully completed a physical layer connection
over one of the network B-channels. It does not indicate the
successful negotiation of a rate adaptation protocol.
When the value 2 is selected and a connection has been broken,
DCD is turned off for the time selected in S-register S10.
All modes of operation may not apply with all selections of rate
adaptation protocols.
Result Codes
OK
Appears when the value is supported.
ERROR
Appears when the selected value is not recognized or is not
supported.
DTR Operation
The DTR Operation Command
&Dvalue
sets the operation of the DTR pin. The following table shows the
allowable values.
Value
Use
0
always on
1
tracks connection (default)
2
always on except temporarily after a disconnect
Value
Use
0
ignored by CTA 500
dm (default)
1
enter the Command State (normally On-line Command State
from On-line Data State)
