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9XCite? ? RS ‐ 232/485 ? RF ? Modem ? – ? Product ? Manual ? v2.1 ? [2007.01.04]
2. ? Interfacing ? Protocol
The 9XCite RS-232/485 RF Modem supports the following interfacing protocols:
? RS-232
? RS-485 (2-wire) Half-duplex
? RS-485 (4-wire) and RS-422
2.1. RS-232 Operation
2.1.1. DIP Switch Settings and Pin Signals
Figure ? 2 ‐ 01.
RS ‐ 232 ? DIP ? Switch ? Settings
Figure ? 2 ‐ 02.
Pins ? used ? on ? the ? female ? RS ‐ 232 ? (DB ‐ 9) ?
Serial ? Connector
DIP ? Switch ? settings ? are ? read ? and ? applied ?
only ? while ? powering ‐ on.
Table ? 2 ‐ 01.
RS ‐ 232 ? Signals ? and ? their ? implementations ? on ? the ? XCite ? RF ? Modem ?
(Low ‐ asserted ? signals ? are ? distinguished ? by ? horizontal ? line ? over ? pin ? name.)
DB-9 Pin
1
2
3
4
5
6
7
8
9
RS-232
Name
DCD
RXD
TXD
DTR
GND
DSR
RTS /
CMD
CTS
RI
Pin Reference
Name*
DO2
DO
DI
DI2
-
DO2
DI1
DO1
-
Description
Data-Carrier-Detect
Received Data
Transmitted Data
Data-Terminal-Ready
Ground Signal
Data-Set-Ready
Request-to-Send /
Command Mode
Clear-to-Send
Ring Indicator
Implementation
Connected to DSR (pin6)
Serial data exiting the RF modem (to host)
Serial data entering into the RF modem (from host)
Can enable Power-Down on the RF modemy
Ground
Connected to DCD (pin1)
Provides RTS flow control or enables Command Mode
Provides CTS flow control
Optional power input that is connected internally to the
positive lead of the front power connector
* ? The ? ‘Pin ? Reference ? Name’ ? provides ? an ? associative ? tag ? that ? references ? commands ? used ? to ? define ? pin ? behaviors. ?
GPI ? stands ? for ?? General ? Purpose ? Input ?? and ? GPO ? stands ? for ?? General ? Purpose ? Output ? . ? As ? an ? example, ? the ? CD ?
command ? is ? used ? to ? define ? the ? behavior ? of ? GPO2 ? (DB ‐ 9 ? pin ? number ? 1). ? The ? ‘Pin ? Reference ? Name’ ? is ? the ? name ?
used ? when ? referring ? to ? XCite ? commands ? and ? parameters.
? ? 2007 ? MaxStream, ? Inc.
????? 7
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