User's Guide
C-8 Interfaces
RS-232-C Serial Interface
The serial interface conforms to the Electronics Industries Association
(EIA) RS-232-C standard for serial communications. This standard
describes a data transfer method between data terminal equipment (DTE)
and data communications equipment (DCE). DTE refers to computers;
DCE refers to modems or other data communications devices. Since the
RS-232-C standard does not take printers into account, manufacturers
are free to produce printers that operate as either DTE or DCE. AMT
printers operate as DTE device.
The RS-232-C serial interface contains 25 lines. Only 10 lines carry
signals or are grounded; the remaining 15 lines are not connected.
Voltages
Each line can carry two voltage levels: high and low. Timed high-to-
low and low-to-high transitions on these lines enable the transfer of
logical information. Valid RS-232-C voltage levels are as follows:
9
9
9
9
9
High (+): +3 to +25 volts
9
9
9
9
9
Low (-):
-25 to -3 volts
Signals and Data Format
The serial interface consists of eight signal lines and two ground lines:
9
9
9
9
9
Data Set Ready
9
9
9
9
9
Data Carrier Detect
9
9
9
9
9
Request To Send
9
9
9
9
9
Clear To Send
9
9
9
9
9
Transmit Data
9
9
9
9
9
Receive Data
9
9
9
9
9
Data Terminal Ready
9
9
9
9
9
Inverted Data Terminal Ready
9
9
9
9
9
Chassis and Signal Grounds
User's Guide
C-8 Interfaces
RS-232-C Serial Interface
The serial interface conforms to the Electronics Industries Association
(EIA) RS-232-C standard for serial communications. This standard
describes a data transfer method between data terminal equipment (DTE)
and data communications equipment (DCE). DTE refers to computers;
DCE refers to modems or other data communications devices. Since the
RS-232-C standard does not take printers into account, manufacturers
are free to produce printers that operate as either DTE or DCE. AMT
printers operate as DTE device.
The RS-232-C serial interface contains 25 lines. Only 10 lines carry
signals or are grounded; the remaining 15 lines are not connected.
Voltages
Each line can carry two voltage levels: high and low. Timed high-to-
low and low-to-high transitions on these lines enable the transfer of
logical information. Valid RS-232-C voltage levels are as follows:
9
9
9
9
9
High (+): +3 to +25 volts
9
9
9
9
9
Low (-):
-25 to -3 volts
Signals and Data Format
The serial interface consists of eight signal lines and two ground lines:
9
9
9
9
9
Data Set Ready
9
9
9
9
9
Data Carrier Detect
9
9
9
9
9
Request To Send
9
9
9
9
9
Clear To Send
9
9
9
9
9
Transmit Data
9
9
9
9
9
Receive Data
9
9
9
9
9
Data Terminal Ready
9
9
9
9
9
Inverted Data Terminal Ready
9
9
9
9
9
Chassis and Signal Grounds
Содержание AMT ACCEL-5350
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