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9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]
RS-485 (4-wire) & RS-422 Operation
DIP Switch Settings and Serial Port Connections
Appendix ? B: ? Development ? Guide
Figure ? B ‐ 20.
RS ‐ 485 ? (4 ‐ wire) ? & ? RS ‐ 422 ?
DIP ? Switch ? Settings
Figure ? B ‐ 21.
Pins ? used ? on ? the ? female ? RS ‐ 232 ? (DB ‐ 9) ?
Serial ? Connector ?
Figure ? B ‐ 22.
RS ‐ 485 ? (4 ‐ wire)& ? RS ‐ 422 ? w/ ? Termination ? (optional)
Termination ? is ? the ? 120 ? Ω ? resistor ? between ? T+ ? and ? T ‐ .
DIP ? Switch ? settings ? are ? read ? and ? applied ? only ? while ? powering ‐ on.
Note: Refer to Figures B-09 and B-10 for RJ-45 connector pin designations used in
RS-485/422 environments.
Table ? B ‐ 06. RS ‐ 485/422 ? (4 ‐ wire) ? Signals ? and ? their ? implementations ? on ? the ? XTend ? Module ? Assembly
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 XTend Module Assembly
Serial data received by the XTend Module Assembly
Ground
Serial data received by the XTend Module Assembly
Serial data sent from the XTend Module Assembly
Optional power input that is connected internally
to the front power connector
not used
Wiring Diagrams
Figure ? B ‐ 23. ?? XTend ? Module ? Assembly ? in ? an ? RS ‐ 485 ? (4 ‐ wire) ? environment
? ? 2007 ? MaxStream, ? Inc.
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