E-1
Appendix E. Port Pin Descriptions
RS-232 Port
The “RS232” port is a partial implementation of RS-232C. It is configured as
Data Communications Equipment (DCE) for direct cable connection to Data
Terminal Equipment (DTE) such as an IBM-PC serial port.
RS-232
CONNECTOR, 9-PIN D-SUB FEMALE
PIN
I/O
DESCRIPTION
1
2
O
TX
3
I
RX
4
5
GND
6
7
8
O
CTS
9
I = Signal Into the radio, 0 = Signal Out of the radio
Only CTS is implemented for flow control. If data arrives (say from a PC)
faster than the radio transmits it, the radio will de-assert CTS when the 640
byte port buffer is full. If the PC continues to send data, the buffer will accept
it and may wrap around over-writing oldest data. LoggerNet monitor CTS to
prevent buffer over-run.
The radio can transmit RF packets slightly in excess of 9600 baud. When RF
packets are received by the radio, that data is immediately sent to the “active
interface” port without flow control (no RTS).
For many applications, the radio works fine with no flow control. The need for
flow control arises when longer standby modes are used, where more data
could be sent than the 640 byte buffer can hold before transmittal. For
example, if the radios are in Standby Mode 6 (see Appendix
), the radio needs to buffer incoming RS-232 data
for up to 8 seconds while waiting for the other radio to wake up before
transmitting it. Also, if the radio is doing a lot of retries, that can take extra
time and require flow control to avoid buffer over-run.
CS I/O Port
The RF401’s CS I/O port is Campbell Scientific's input/output port. It is not a
standard RS-232 pin-out. The following table provides pin-out information on
the port when connected to a datalogger.
Summary of Contents for RF401
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Page 16: ...Table of Contents vi...
Page 56: ...Appendix A Part 15 FCC Compliance Warning A 2...
Page 76: ...Appendix D Setting Up RF401 to CR206 X Communications D 10...
Page 94: ...Appendix H Distance vs Antenna Gain Terrain and Other Factors H 8...
Page 98: ...Appendix I Phone to RF401 Series I 4 FIGURE I 2 Phone base configuration...
Page 99: ...Appendix I Phone to RF401 Series I 5 FIGURE I 3 Enter the base site s phone number...
Page 114: ...Appendix K RF401 RF411 Pass Fail Tests K 8...
Page 124: ...Appendix L RF401 RF411 Average Current Drain Calculations L 10...
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