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9XCite? ? RS ‐ 232/485 ? RF ? Modem ? – ? Product ? Manual ? v2.1 ? [2007.01.04]
2.3. RS-485 (4-wire) & RS-422 Operation
2.3.1. DIP Switch Settings and Pin Signals
Figure ? 2 ‐ 10.
RS ‐ 485 ? (2 ‐ wire) ? Half ‐ duplex
DIP ? Switch ? Settings
Figure ? 2 ‐ 12.
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.
Figure ? 2 ‐ 11.
Pins ? used ? on ? the ? female ? RS ‐ 232 ? (DB ‐ 9) ?
Serial ? Connector
Table ? 2 ‐ 03.
RS ‐ 485/422 ? (4 ‐ wire) ? Signals ? and ? their ? implementations ? on ? the ? XCite ? RF ? Modem
DB-9 Pin
2
3
5
7
8
9
1, 4, 6
RS-485/422
Name
T- (TA)
R- (RA)
GND
R+ (RB)
T+ (TB)
PWR
Description
Transmit Negative
Data Line
Receive Negative
Data Line
Signal Ground
Receive Positive
Data Line
Transmit Positive
Data Line
Power
Implementation
Serial data sent from the RF modem
Serial data received by the RF modem
Ground
Serial data received by the RF modem
Serial data sent from the RF modem
Optional power input that is connected internally
to the front power connector
not used
2.3.2. Wiring Diagrams
Figure ? 2 ‐ 13. XCite ? RF ? Modem ? in ? an ? RS ‐ 485 ? (4 ‐ wire) ? environment
? ? 2007 ? MaxStream, ? Inc.
????? 10
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