Omron NT31 User Manual

564
Outline of Communications
Section 9-3
9-2 Outline of Communications
This section describes the basic communication protocol when using memory link
and the program flow for using memory link, taking RS-232C communications us-
ing the BASIC language as an example.
9-2-1 Communication Protocol
Communication between the host and the NT31/NT31C takes place in accor-
dance with the following protocol.
(1) In order to perform communications, it is necessary to open the communica-
tion line. “Opening” here means making the line usable.
(2) In accordance with the commands, the NT31/NT31C is controlled or notifica-
tion is received from the NT31/NT31C.
(3) To terminate communication, close the communication line.
[Host program]
OPEN instruction
PRINT #instruction
LINE INPUT
CLOSE instruction
Line opened
Command
transmission
Line closed
#instruction
Command/
response
transmission
Command/
response
transmission
Command
reception
Communication line
[Operation at NT31/NT31C]
Open state





Once the line has been opened, it can be used until it is closed.
S Function of each instruction
OPEN instruction : Opens the RS-232C line.
Also sets the communication conditions at the host
side (see page 88, 132).
PRINT #instruction : Sends commands to the NT31/NT31C via an
RS-232C line.
LINE INPUT #instruction : Receives the command or response from the
NT31/NT31C.
In order to receive input delimited by commas and
double quotation marks, use “LINE INPUT”.
CLOSE instruction : Closes the RS-232C line.
For detailed information on instructions, refer to the BASIC language instruction
manual for the host.

Omron NT31 Specifications

General

Display Type	STN LCD
Touch Panel	Analog resistive
Communication Interface	RS-232C, RS-422/485
Power Supply	24 VDC
Operating Temperature	0 to 50 °C
Storage Temperature	-20 to 60 °C
Display Size	5.7 inch
Resolution	320 x 240 pixels
CPU	32-bit RISC
Humidity	10 to 90% RH (non-condensing)
Shock Resistance	15 G for 11 ms
Protection class	IP65 (front panel)