QuickLink SCADA PRO 900 User Manual - Scada Pro 900 Data Radio
SCADA PRO 900 WIRELESS DATA MODEM
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Revision A
USER’S GUIDE
17
SCADA PRO 900 Data Radio
LED
I
NDICATORS
Yellow indicates the radio is ready to accept data from the user-
connected equipment.
Green indicates data is being sent from the radio to the user-connected
equipment.
Red indicates data is being sent from the user-connected equipment to
the radio.
DB-9 Pin Out (RS-232)
PIN 1 – DCD (Data Carrier Detect) is always held high by the radio.
PIN 2 – RD (Receive Data) is serial data from the radio to the user device.
PIN 3 – TD (Transmit Data) is serial data from the user device to the radio.
PIN 4 – DTR (Data Terminal Ready) indicates the user device is ready to send
data to the radio for transmission. When this line is high, the radio
will transmit any data across the RF network. When this line is low,
the radio will process the data as commands.
If this pin is unused
it should be tied to PIN 1.
PIN 5 – GND (Ground) is the interface common.
PIN 6 – DSR (Data Set Ready) is always held high by the radio.
PIN 7 – RTS (Request To Send) is not connected on an RS-232 Interface
board.
PIN 8 – CTS (Clear To Send) is used to indicate to the user device that the
radio can accept more data. When this line is high, the user device is
clear to send more data. When this line is low, the user device should
not send data. (This line may be ignored at baud rates of 2400 and
4800 bps. The TX Packet size should be changed to 150 bytes to
prevent a buffer overflow.)
PIN 9 – RI (Ring Indicator) is not connected on an RS-232 Interface board.