Digi XBee-PRO XM-M92-2P Series, Руководство по эксплуатации продукта, Страница: 10 / 23

XBee
‐
PRO® 900HP RS
‐
232/RS
‐
485/USB RF Modem
‐
Product Manual
© 2013 Digi International Inc. 10
2. Interfacing Protocol
The XBee-PRO 900HP RS-232/485/USB RF Modem supports the following interfacing protocols:
• RS-232
• RS-485 (2-wire) half-duplex
• RS-485 (4-wire) and RS-422
• USB
2 .1 . RS- 2 3 2 Ope r a t ion
2 .1 .1 . RS- 2 3 2 Pin Sign a ls
Figure 2
‐
01. Pins used on the female RS
‐
232 (DB
‐
9) Serial Connector

Table 2
‐
01. RS
‐
232 Pin Assignments and Implementation
DB-9 Pin RS-232 Name Description Implementation
1 DCD Data-Carrier-Detect Connected to DSR (pin 6)
2 RXD Received Data
Serial data exiting the RF modem (from
host)
3 TXD Transmitted Data
Serial data entering into the RF modem
(from host)
4 DTR Data-Terminal-Ready 2 – 0xFFFF [x 100 msec]
5 GND Ground Signal 0x20 – 0x7F
6 DSR Data-Set-Ready 0 - 4
7 RTS / CMD Request-to-Send/Command Mode
RTS (request-to-send) flow control: By
default, this pin is not used. To configure
this pin to regulate the flow of serial data
exiting the modem, refer to the Serial
Communications and
RT command section
CMD: Refer to Binary Commands and
RT Command Sections to enable binary
command programming
8 CTS Clear-to-Send
CTS (clear-to-send) flow control –When
pin is driven low, UART host is permitted
to send serial data to the modem. Refer
to the Serial Communications and CS
Command sections for more information
9 RI Ring Indicator
Optional power input (protection circuitry
to prevent back flow from other power
sources internal to the board)