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XStream-PKG-R™ RS-232/485 RF Modem – Product Manual v5.x00
2 .2 . RS- 4 8 5 ( 2 - w ir e ) Ope r a t ion
2 .2 .1 . D I P Sw it ch Se t t in gs a n d Pin Sign a ls
Figure 2.6.
Figure 2.7.
RS-485 (2-wire) Half-Duplex
Pins used on the female RS-232 (DB-9)
DIP Switch Settings
Serial Connector
Figure 2.8.
RS-485 (2-wire) with Termination (optional)
Termination is the 120 Ω resistor between T+ and T
- .
DI P Sw it ch set t ings ar e r ead and applied only w hile pow er ing- on.
Note: Refer to Figures 2.15 and 2.16 for RJ-45 connector pin designations used in
RS-485/422 environments.
Table 2.2.
RS-485 (2-wire half-duplex) Signals and their implementations on the XStream RF Modem
DB-9 Pin
RS-485 Name
Description
Implementation
2
T/R- (TRA)
Negative Data Line
Transmit serial data to and from the
XStream RF Modem
5
GND
Ground Signal
Ground
8
T/R+ (TRB)
Positive Data Line
Transmit serial data to and from the
XStream RF Modem
9
PWR
Power
Optional power input that is connected internally
to the front power connector
1, 3, 4, 6, 7
not used
W ir in g D ia gr a m : RS- 4 8 5 ( 2 - w ir e ) H a lf- D uple x
Figure 2.9. XStream RF Modem in an RS-485 (2-wire) half-duplex environment
© 2014 Digi International Inc.
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