9XTend
‐
PKG
‐
E™
Ethernet
RF
Modem
–
Product
Manual
v2.x4x
[2007.01.04]
©
2007
MaxStream,
Inc.,
Confidential
&
Proprietary
‐
All
Rights
Reserved
18
3 .2 .5 . Com m a n d M ode
To m odify or read m odem param et ers, t he m odem m ust first ent er int o Com m and Mode ( st at e in
w hich incom ing charact er s are int erpret ed as com m ands) . Tw o com m and t ypes are support ed:
• AT Com m ands
• Binary Com m ands
For m odified param et er values t o persist in t he m odem regist ry, changes m ust be saved t o non-
volat ile m em or y using t he WR ( Wr it e) com m and. Ot herw ise, param et ers are rest ored t o previously
saved values w hen t he m odem is pow ered off and t hen on again.
AT Com m a n d M ode
To En t e r AT Com m a n d M ode :
Default AT Com m and Mode Sequence ( for t ransit ion t o Com m and Mode) :
• No charact er s sent for one second [ refer t o t he BT ( Guard Tim e Before) Com m and]
• I nput t hree plus charact ers ( “ + + + ” ) wit hin one second
[ refer t o t he CC ( Com m and Sequence Charact er) Com m and.]
• No charact er s sent for one second [ refer t o t he AT ( Guard Tim e Aft er) Com m and.]
All of t he param et er values in t he sequence can be m odified t o reflect user preferences.
To Se n d AT Com m a nds:
Figure
3
‐
05.
Syntax
for
sending
AT
Commands
To read a parameter value stored in the modem register, leave the parameter field blank.
The preceding exam ple w ould change t he m odem ’s Dest inat ion Address t o " 0x1F" . To st ore t he
new value t o non- volat ile ( long t erm ) m em ory, t he Writ e ( ATWR) com m and m ust subsequent ly be
sent before pow ering off t he m odem .
Sy st e m Re sponse .
When a com m and is sent t o t he m odem , t he m odem will parse and execut e
t he com m and. Upon successful execut ion of a com m and, t he m odem ret urns an “ OK” m essage. I f
execut ion of a com m and result s in an error, t he m odem ret urns an “ ERROR” m essage.
To Ex it AT Com m a n d M ode :
For an example of programming the RF modem using AT Commands and descriptions of each config-
urable parameter, refer to the "RF Modem Configuration" chapter [p20].
1.
Send t he 3- charact er com m and sequence " + + + " and observe guard t im es before and aft er
t he com m and charact er s. [ refer t o ‘Default AT Com m and Mode Sequence’ below.] The ‘Ter-
m inal’ t ab ( or ot her serial com m unicat ions soft ware) of t he X- CTU Soft ware can be used t o
ent er t he sequence.
[ OR]
2.
Assert ( low ) t he CONFI G pin and t urn t he pow er going t o t he m odem off and back on ( or
pulse t he SHDN pin) .
[ I f t he m odem is m ount ed t o a MaxSt r eam RS- 232/ 485 I nt er face Board, t he result can be
achieved by pressing t he configurat ion sw it ch down for 2 seconds.]
Send AT com m ands and param et ers using t he synt ax show n below.
1.
I f no valid AT Com m ands are received w it hin t he t im e specified by CT ( Com m and Mode
Tim eout ) Com m and, t he m odem aut om at ically r et ur ns t o I dle Mode.
[ OR]
2.
Send ATCN ( Exit Com m and Mode) Com m and.
