XStream-PKG-R™ RS-232/485 RF Modem – Product Manual v5.x00
3.
RF Modem Operation
3 .1 . Se r ia l Com m u n ica t ion s
3 .1 .1 . RS- 2 3 2 a n d RS- 4 8 5 / 4 2 2 D a t a Flow
Dev ices t hat hav e a UART int er face can connect dir ect ly t hr ough t he pins of t he XSt r eam Modem
as is show n in t he figure below .
Figure 3.1.
System Data Flow Diagram in a UART-interfaced environment
(Low-asserted signals distinguished with horizontal line over signal name.)
3 .1 .2 . H ost a n d RF M ode m I / O Se t t in g s
Ser ial com m unicat ions bet ween a host and an XSt r eam RF Modem are dependent upon hav ing
m at ching baud r at e, par it y , stop bit and num ber of dat a bits set t ings. Failur e t o ent er t he m odem
int o AT Com m and Mode is m ost com m only due t o baud r at e m ism at ch. Refer t o t he t able below
t o ensur e host ser ial por t set t ings m at ch t hose of t he m odem .
Table 3.1.
Parameter values critical to serial communications between the RF Modem and host
Parameter Setting
XStream RF Modem Default Parameter Value
Baud (Serial Data Rate)
9600 bps or 19200 baud (Factory-set RF data rates)
Number of Data Bits
8
(NB parameter = 0)
Parity
None
(NB parameter = 0)
Number of Stop Bits
1
(NB parameter = 0)
Bot h t he XSt ream RF Modem and host ( PC) set t ings can be v iew ed and adj ust ed using Digi’s
propr iet ar y XCTU Soft w ar e. Use t he “ PC Set t ings” t ab t o configur e host set t ings. Use t he
“ Ter m inal” or “ Modem Configur at ion” t abs t o configur e t he RF Modem set t ings. Refer to t he RF
Modem Configur at ion sect ions for m or e infor m at ion ( p21) .
© 2014 Digi International Inc.
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