MaxStream 9 XTend- PKG- E, Manual

Page: 26 / 26

9XTend
‐
PKG
‐
E™ Ethernet RF Modem – Product Manual v2.x4x [2007.01.04]
© 2007 MaxStream, Inc., Confidential & Proprietary
‐
All Rights Reserved 25
BD ( I n t e r fa ce D a t a Ra t e ) Com m a n d
< Serial I nt erfacing> The BD com m and is used t o
set and read t he serial int erface dat a rat e ( baud
rat e) used bet w een t he RF m odem and host . This
param et er det erm ines t he rat e at w hich ser ial
dat a is sent t o t he m odem from t he host . Modified
int er face dat a rat es do not t ake effect unt il t he CN
( Exit AT Com m and Mode) com m and is issued and
t he syst em ret urns t he 'OK' response.
When param et ers 0- 8 are sent t o t he m odem , t he
respect ive int erface dat a rat es are used ( as
show n in t he t able on t he right ) .
The RF dat a rat e is not affect ed by t he BD param -
et er. I f t he int erface dat a rat e is set higher t han
t he RF dat a rat e, a flow cont rol configurat ion m ay
need t o be im plem ent ed.
The range bet w een st andard and non- st andard
baud rat es ( 0x09 - 0x38) is invalid.
N on - st a n da r d I n t e r fa ce D a t a Ra t e s:
Any value above 0x38 w ill be int erpret ed as an
act ual baud rat e. When a value above 0x38 is
sent , t he closest int erface dat a rat e r epr esent ed
by t he num ber is st ored in t he BD r egist er. For exam ple, a rat e of 19200 bps can be set by sending
t he follow ing com m and line " ATBD4B00" . NOTE: When using MaxSt ream ’s X- CTU Soft ware, non-
st andard int erface dat a rat es can only be set and read using t he X- CTU ‘Term inal’ t ab. Non- st an-
dard rat es are not accessible t hrough t he ‘Modem Configurat ion’ t ab.
When t he BD com m and is sent wit h a non- st andard int erface dat a rat e, t he UART w ill adj ust t o
accom m odat e t he request ed int erface rat e. I n m ost cases, t he clock resolut ion w ill cause t he
st ored BD param et er t o vary from t he param et er t hat was sent ( refer t o t he t able below ) . Reading
t he BD com m and ( send " ATBD" com m and w it hout an associat ed param et er value) w ill ret urn t he
value act ually st ored in t he m odem ’s BD regist er.
BR ( RF D a t a Ra t e ) Com m a n d
< RF I nt er facing> The BR com m and is used t o set
and read t he RF dat a rat e ( rat e t hat RF dat a is
t ransm it t ed over- t he- air) of t he m odem .
Parameters Sent Versus Parameters Stored
BD Parameter Sent (HEX) Interface Data Rate (bps) BD Parameter Stored (HEX)
0 1200 0
4 19,200 4
7 115,200 7
12C 300 12B
1C200 115,200 1B207
AT Command: ATBD
Binary Command: 0x15 (21 decimal)
Parameter Ranges: 0 - 8 (standard rates)
0x39 - 0x1C9C38 (non-standard rates)
Parameter Configuration (bps)
0 1200
1 2400
2 4800
3 9600
4 19200
5 38400
6 57600
7 115200
8 230400
Default Parameter Value: 3
Non-standard baud rates supported as of
firmware v2.x20
Number of bytes returned: 4
AT Command: ATBR
Binary Command: 0x39 (57 decimal)
Parameter Range: 0 - 1
Parameter
Baud (bps)
Configuration
0 9600
1 115200
Default Parameter Value:1
Number of bytes returned: 1