9XTend-NEMA RS-232/485, Руководство по эксплуатации продукта

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9XTend ‐ NEMA™ RS ‐ 232/485 RF Modem – Product Manual v2.x4x [2007.01.04]
© 2007 MaxStream, Inc., Confidential & Proprietary ‐ All Rights Reserved 10
2.2. RS-485 (2-wire) Operation
2.2.1. DIP Switch Settings and Pin Signals
Note: Refer to Figure 2-15 and Figure 2-16 for the RJ-45 connector pin designations used in
RS-485/422 environments.
2.2.2. Wiring Diagram
Figure 2 ‐ 09. Figure 2 ‐ 09. XTend RF Modem in an RS ‐ 485 (2 ‐ wire) half ‐ duplex environment
Table 2 ‐ 02. RS ‐ 485 (2 ‐ wire half ‐ duplex) signals and their implementations on the XTend RF Modem
DB-9 Pin RS-485 Name Description Implementation
2 T/R- (TRA) Negative Data Line Transmit serial data to and from the RF modem
5 GND Ground Signal Ground
8 T/R+ (TRB) Positive Data Line Transmit serial data to and from the RF modem
9 PWR Power
Optional power input that is connected internally
to the front power connector
1, 3, 4, 6, 7 not used
Figure 2 ‐ 06. RS ‐ 485 (2 ‐ wire) Half ‐ duplex
DIP Switch Settings
Figure 2 ‐ 07. Pins used on the female RS ‐ 232 (DB ‐ 9)
Serial Connector
Figure 2 ‐ 08. RS ‐ 485 (2 ‐ wire) w/ Termination
(optional)
Termination is the 120
Ω
resistor between T+ and T ‐ .
DIP Switch settings are read and applied
only while powering ‐ on.