User Manual

Appendix C Hayes AT Command Reference
RFI-9256 Radio Modem User Manual Page 81 of 96
C.2.5 ATS21” Set Security Code
S-register 21 sets the network security code for this radio. The range of values is from 0 to 4294967295. All
radios on a single network must have the same security code in order to maintain communications.
ATS21=5839238<CR>
: Sets the security code to 5839238.
C.2.6 ATS39” RX Packet Timer
S-register 39 contains the RX (in) packetiser timer. Packet timers are in the range 0 to 1000ms. When a
value of 0 is set for s-register 39 packetising is disabled.
ATS39=30<CR>
: Sets a 30ms RX packetisation timer.
ATS39=0<CR>
: Disables the RX packetisation timer.
C.2.7 ATS40” TX Packet Timer
S-register 40 contains the TX (out) packetiser. Packet timers are in the range 0 to 1000ms. When a value of 0
is set for s-register 40 packetising is disabled.
ATS40=870<CR>
: Sets an 870ms TX packetisation timer.
ATS40=0<CR>
: Disables the TX packetisation timer.
C.2.8 ATS41” Number of Retries
S-register 41 contains the number of retries used by the radio, and is within the range 0 to 255 where a value
of 0 will disable retries.
ATS41=25<CR>
: Sets 25 retries.
ATS41=0<CR>
: Disables retries.
C.2.9 ATS42” Network fail timeout
S-register 42 sets the network fail timeout. The network fail timeout is the amount of time that must pass
with no data being received on a slave for it to give up trying to communicate with its master and return to
hunting for a connection. The network fail timer is configurable between 100 and 30000ms.
ATS42=15000<CR>
: Sets the network fail timeout to occur after 15 seconds without contact
between the slave and the master.
C.2.10 “ATS43” Online requests timer
S-register 43 sets the online request timer. The online request timer is the time between automatic
background polling between point-to-point and Hayes dial-up units to ensure that connections still exist. It
can be configured to between 100ms and 30000ms, and must be less than the network fail timer. For more
information about online requests see section 4.3.6.