Campbell Scientific RF401A-Series Spread Spectrum Radios - Manual (Page 18)

RF401A-Series Spread Spectrum Radio
4 RX O Serial data receive line
5 Modem Enable I Raised when datalogger determines
that associated modem raised the ring
line
6 Synchronous
Device Enable
I Used by datalogger to address
synchronous devices; can be used as a
printer enable
7 CLK/Handshake I/O Used by datalogger with SDE and TX
lines to transfer data to synchronous
devices
8 12V supplied by
datalogger
PWR Sources 12 Vdc to power peripherals
9 TX I Serial data transmit line
I = Signal into the RF401A series, O = Signal out of the RF401A series
7.5 RS-232
The RS-232 port is a DCE, 9-pin female D-Sub connector used to for
connecting the radio to the RS-232 port of a datalogger, computer, or another
RS-232 device. This connection is most commonly used when connecting the
radio to a device without a CS I/O port or when linking two communication
peripherals, for example directly connecting the radio to an Ethernet serial
server.
The RS-232 port can be connected to a DTE device, like a computer or NL201,
using the pn 10873, 9-Pin female to 9-Pin male serial cable. The RS-232 port
can be connected to another DCE device, like a datalogger RS-232 or MD485
or cellular modem, using the 18663 9-pin male-to-male null modem serial
cable.
When using RS-232, 12 Vdc power should be supplied to the power connector
using a field power connector or AC power adapter. The Active Interface
setting must be set to RS-232, and the RS-232 port configuration, like baud
rate, should match the device the radio is connected to.
RS-232 cannot be used for radio configuration using Device Configuration
Utility.
TABLE 7-3. RS-232 Pinout (9-PIN D-SUB FEMALE)
PIN I/O DESCRIPTION
1
2 O TX
3 I RX
4
5 GND
6
8