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:
99
99
9High (+): +3 to +25 volts
99
99
9Low (-): -25 to -3 volts

Signals and Data Format

The serial interface consists of eight signal lines and two ground lines:
99
99
9Data Set Ready
99
99
9Data Carrier Detect
99
99
9Request To Send
99
99
9Clear To Send
99
99
9Transmit Data
99
99
9Receive Data
99
99
9Data Terminal Ready
99
99
9Inverted Data Terminal Ready
99
99
9Chassis 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:
99
99
9High (+): +3 to +25 volts
99
99
9Low (-): -25 to -3 volts

Signals and Data Format

The serial interface consists of eight signal lines and two ground lines:
99
99
9Data Set Ready
99
99
9Data Carrier Detect
99
99
9Request To Send
99
99
9Clear To Send
99
99
9Transmit Data
99
99
9Receive Data
99
99
9Data Terminal Ready
99
99
9Inverted Data Terminal Ready
99
99
9Chassis and Signal Grounds