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SECTION 6. 9-PIN SERIAL INPUT/OUTPUT
6-7
TABLE 6.2-4. DTE Pin Configuration
PIN
=
25-pin connector number
ABR =
Abbreviation for the function name
O
=
Signal Out of terminal to another device
I
=
Signal Into terminal from another device
PIN
ABR
I/O
FUNCTION
2
TD
O
Transmitted Data: Data
is transmitted from the
terminal on this line.
3
RD
I
Received Data: Data is
received by the terminal
on this line.
4
RTS
O
Request to Send: The
terminal raises this line
to ask a receiving device
if the terminal can
transmit data.
5
CTS
I
Clear to Send: The
receiving device raises
this line to let the
terminal know that the
receiving device is ready
to accept data.
20
DTR
O
Data Terminal Ready:
The terminal raises this
line to tell the modem to
connect itself to the
telephone line.
6
DSR
I
Data Set Ready: The
modem raises this line to
tell the terminal that the
modem is connected to
the phone line.
8
DCD
I
Data Carrier Detect: The
modem raises this line to
tell the terminal that the
modem is receiving a
valid carrier signal from
the phone line.
22
RI
I
Ring Indicator: The
modem raises this line to
tell the terminal that the
phone is ringing.
7
SG
Signal Ground: Voltages
are measured relative to
this point.
6.2.6.3 COMMUNICATION
PROTOCOL/TROUBLE SHOOTING
The ASCII standard defines an alphabet
consisting of 128 different characters where
each character corresponds to a number, letter,
symbol, or control code.
An ASCII character is a binary digital code
composed of a combination of seven "bits", each
bit having a binary state of 1 (one) or 0 (zero).
For example, the binary equivalent for the ASCII
character "1" is 0110001 (decimal 49).
ASCII characters are transmitted one bit at a
time, starting with the 1st (least significant) bit.
During data transmission the marking condition
is used to denote the binary state 1, and the
spacing condition for the binary state 0. The
signal is considered marking when the voltage
is more negative than minus three volts with
respect to ground, and spacing when the
voltage is more positive than plus three volts.
Most computers use 8-bits (1 byte) for data
communications. The 8th bit is sometimes
used for a type of error checking called parity-
checking. Even parity binary characters have
an even number of 1's, odd-parity characters
have an odd number of 1's. When parity
checking is used, the 8th bit is set to either a 1
or a 0 to make the parity of the character
correct. The CR23X ignores the 8th bit of a
character that is receives, and transmits the 8th
bit as a binary 0. This method is generally
described as "no parity".
To separate ASCII characters, a Start bit is sent
before the 1st bit and a Stop bit is sent after the
8th bit. The start bit is always a space, and the
stop bit is always a mark. Between characters
the signal is in the marking condition.
Figure 6.2-5 shows how the ASCII character "1"
is transmitted. When transmitted by the CR23X
using the SC32A RS-232 interface spacing and
marking voltages are positive and negative, as
shown. Signal voltages at the CS I/O port are
5V in the spacing condition, and 0V in the
marking condition.
Summary of Contents for CR23X
Page 8: ...CR23X TABLE OF CONTENTS vi This is a blank page ...
Page 12: ...CR23X MICROLOGGER OVERVIEW OV 2 1 2 3 A 4 5 6 B 7 8 9 C 0 D FIGURE OV1 1 CR23X Micrologger ...
Page 34: ...CR23X MICROLOGGER OVERVIEW OV 24 This is a blank page ...
Page 50: ...SECTION 1 FUNCTIONAL MODES 1 16 This is a blank page ...
Page 72: ...SECTION 4 EXTERNAL STORAGE PERIPHERALS 4 8 This is a blank page ...
Page 88: ...SECTION 6 9 PIN SERIAL INPUT OUTPUT 6 10 This is a blank page ...
Page 110: ...SECTION 7 MEASUREMENT PROGRAMMING EXAMPLES 7 22 This is a blank page ...
Page 134: ...SECTION 8 PROCESSING AND PROGRAM CONTROL EXAMPLES 8 24 This is a blank page ...
Page 164: ...SECTION 9 INPUT OUTPUT INSTRUCTIONS 9 30 This is a blankpage ...
Page 188: ...SECTION 11 OUTPUT PROCESSING INSTRUCTIONS 11 8 This is a blankp age ...
Page 221: ...SECTION 13 CR23X MEASUREMENTS 13 21 FIGURE 13 5 1 Circuits Used with Instructions 4 9 ...
Page 229: ...14 3 1 2 3 A 4 5 6 B 7 8 9 C 0 D FIGURE 14 3 1 CR23X Battery Pack and Panel ...
Page 240: ...SECTION 14 INSTALLATION AND MAINTENANCE 14 14 This is a blank page ...
Page 244: ...APPENDIX A GLOSSARY A 4 This is a blank page ...
Page 268: ...APPENDIX B CONTROL PORT SERIAL I O INSTRUCTION 15 B 24 This is a blank page ...
Page 276: ...APPENDIX C BINARY TELECOMMUNICATIONS C 8 This is a blank page ...
Page 278: ...This is a blank page ...
Page 282: ...APPENDIX F DYNAGAGE SAP FLOW P67 F 4 This is a blank page ...
Page 299: ...APPENDIX I TD OPERATING SYSTEM ADDENDUM FOR CR510 CR10X AND CR23X MANUALS ...
Page 300: ...This is a blank page ...
Page 302: ...This is a blank page ...
Page 308: ...TABLE DATA ADDENDUM AD 6 This is a blank page ...
Page 324: ...TD ADDENDUM SECTION 1 FUNCTIONAL MODES AD 1 8 This is a blank page ...
Page 340: ...TD ADDENDUM SECTION 8 PROCESSING AND PROGRAM CONTROL EXAMPLES AD 8 10 This is a blank page ...
Page 342: ...This is a blank page ...
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