62 Rev. 2
Remote Interface Reference
5.3 SCPI Serial (RS-232) Communication
An RS-232 serial communication port is available as a 9-pin D-type
connector on the rear panel of the instrument for serial communication
function.
5.3.1 Serial port connector and cabling
An PC-compatible computer’s serial port can be directly connected to the
Model 1700 via a standard cable. Refer to the computer’s documentation to
determine which serial ports are available on a computer and the required
connector type.
The Model 1700 uses three wires of the rear-panel DB25 connector: pin 2
(transmit), pin 3 (receive), and pin 7 (common). There is no software or
hardware handshaking. The Model 1700 is classified as a DCE (Data
Communication Equipment) device since it transmits data on pin 3 and
receives data on pin 2. The instrument to which the Model 1700 is
attached must do the opposite, i.e., transmit on pin 2 and receive on pin 3
(the requirements for a DTE, or Data Terminal Equipment device). If a
serial-to-parallel converter is used, it must be capable of receiving data on
pin 3 or the cable connected to the Model 1700 must interchange the wires
between pins 2 and 3.
5.4 Command/return termination characters
All commands are transmitted and received as ASCII values and are case
insensitive. The Model 1700 always transmits <CR><LF> (i.e. a carriage
return followed by a linefeed) at the end of an serial transmission. The
Model 1700 can accept <CR>, <LF>, <CR><LF>, or <LF><CR> as
termination characters from an external computer.
The simplest method for communicating with the Model 1700 via RS-232
is by using the interactive mode of a commercially available terminal
emulation program. The Model 1700 transmits and receives information at
a baud rate of 115,200 and uses 8 data bits, no parity, and 1 stop bit. When
the Model 1700 receives a terminated ASCII string, it always sends back a
reply as soon as the string is processed. When sending commands to the
Model 1700, you must wait for the reply from the Model 1700 before
sending another command even if the reply consists of only termination
characters. Otherwise, the shared input/output command buffer of the
Model 1700 may become corrupted.
The host device can be a standard dot matrix printer connected via a
serial-to-parallel converter, or connected directly with a printer capable of
receiving serial data. Presumably, any serial-to-parallel converter which
can be properly configured is acceptable. AMI has tested the Model 1700
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