Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
Remote Operation
4-1
CHAPTER 4
REMOTE OPERATION
4.0 GENERAL
The Model 321 is equipped with an RS-232C serial computer interface. The interface allows computer
automation of instrument setup and field measurement data collection. Nearly every feature of the
instrument can be accessed through the computer interface. Interface capabilities including setup
information and Basic programs are provided in Paragraph 4.1. Interface commands including a
command summary are detailed in Paragraph 4.2.
4.1 SERIAL INTERFACE OVERVIEW
The serial interface used in the Model 321 is commonly referred to as an RS-232C interface. RS-232C
is a standard of the Electronics Industries Association (EIA) that describes one of the most common
interfaces between computers and electronic equipment. The RS-232C standard is quite flexible and
allows many different configurations. However, any two devices claiming RS-232C compatibility cannot
necessarily be plugged together without interface setup. The remainder of this paragraph briefly
describes the key features of a serial interface that are supported by the instrument. A customer
supplied computer with similarly configured interface port is required to enable communication.
4.1.1 Physical
Connection
The Model 321 has an RJ-11 connector on the rear panel for serial communication. The original
RS-232C standard specifies 25 pins, but 9-pin, 25-pin, and RJ-11 connectors are commonly used in
the computer industry. For you convenience, Lake Shore offers a Model 2001 RJ-11 Cable. When
combined with either the Model 2002 DB-25 Adapter or Model 2003 DE-9 Adapter, this cable
assembly can be used to connect the instrument to a computer with the corresponding connector
type (See Figure 4-1). These adapters are described in Chapter 5 – Options and Accessories and are
schematically diagramed in Figures 6-6 thru 6-8.
LSCI Model
2002 RJ-11
to DB-25
Adapter
To customer-supplied
computer with DB-25
Serial Interface
Connector configured
as DCE. If the interface
is DTE, a Null Modem
Adapter is required to
exchange Transmit and
Receive lines.
SERIAL I/O
SERIAL I/O
LSCI Model 2003 RJ-11
to DE-9 Adapter
LSCI Model 2001 RJ-11
Cable Assembly
Serial Interface
Output on rear of
Model 321
The Model 2001, 2002, and 2003 are
options available from Lake Shore.
Use whichever adapter that matches
your computer serial interface
connector. Pin outs are described in
Paragraph 5.4.
To customer-supplied
computer with DE-9
Serial Interface
Connector configured as
DTE. If the interface is
DCE, a Null Modem
Adapter is required to
exchange Transmit and
Receive lines.
1
C-321-4-1.eps
Figure 4-1. Optional Serial Interface Connections
