Chapter 7: AT Commands and Registers
7-52 CSMIM-T1 Hardware Installation Guide
When the originating modem is set for V.21 or V.23 operation,
:T3 determines how long the modem waits after detecting
answer tone before proceeding with the connection. When :T3
is set to 0, the originating modem does not wait for answer tone.
:T4=
n
Timer for Line Turnaround Delay - Carrier On
Where n is an integer from 0 to 255 (in increments of 12.5
milliseconds). Default is 20 (250 milliseconds).
This command takes effect only during normal mode V.23
half-duplex connections.
After the modem turns carrier off, determines the minimum
time the modem waits for the remote modem to respond before
turning carrier back on again to resume sending data.
:T5=
n
Timer for V.23 Half-Duplex Intercharacter Delay
Where n is an integer from 0 to 255 (in increments of 12.5
milliseconds). Default is 7 (87.5 milliseconds).
This command takes effect only during normal mode V.23
half-duplex connections.
Sets the length of time the modem waits after transmitting the
last data character in the transmit buffer before turning carrier
off. :T5 may need to be adjusted if the local computer
intercharacter time causes excessive line turnarounds.
:T6=
n
Timer for DCD Turn On Delay
Where n is an integer from 0 to 255, representing milliseconds.
Default is 200 milliseconds (2 tenths of a second).
This command takes effect during only normal mode V.23
half-duplex connections.
Sets how long the modem waits after carrier goes on before it
starts looking for data. This command may be set to exclude the
turn on noise that occurs when DCD turns On during V.23
half-duplex connections.
If :T6 is set to 0, the modem waits 256 milliseconds before
looking for data.