Modem; System Setup - IDEC OpenNet series User Manual

23: M
ODEM
Introduction
This chapter describes the modem mode designed for communication between the
Net Controller or any data terminal equipment through telephone lines. Using the modem mode, the
can initialize a modem, dial a telephone number, send an AT command, enable the answer mode to wait for an incoming
call, and disconnect the telephone line. All of these operations can be performed simply by turning on a start internal relay
dedicated to each operation.
• The modem mode provides for a simple modem control function so that the
Caution
can initialize a modem, dial a destination telephone number, or answer an incoming call. The per-
formance of the modem communication using the modem mode depends on the modem functions
and telephone line situations. The modem mode does not prevent intrusion or malfunctions of
other systems. For practical applications, confirm the communication function using the actual
system setup and include safety provisions.
• While communicating through modems, the telephone line may be disconnected unexpectedly or
receive data errors may occur. Provisions against such errors must be included in the user program.

System Setup

To connect a modem to the RS232C port 1 or 2 on the
enable the modem mode, make the two settings described below:
1. Set communication selector DIP switch 2 or 3 to ON to select user communication mode for RS232C port 1 or 2,
respectively. (See page 2-2.) Both RS232C port 1 and 2 can be used for modem communication at the same time.
2. Enter 1 to data register D8200 or D8300 (RS232C port communication mode selection) to enable the modem mode for
RS232C port 1 or 2, respectively. (See page 23-3.)
POWER
RUN
ERROR
HSC OUT
DIP
Switch
Mini DIN Connector Pinouts
Description
Shield
RTS Request to Send
DTR Data Terminal Ready
TXD Transmit Data
RXD Receive Data
DSR Data Set Ready
SG Signal Ground
SG Signal Ground
NC No Connection
• Do not connect the NC (no connection) pin to any line; otherwise, the
Caution
modem may be damaged.
• Modem cables for Apple Macintosh computers cannot be used for the
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M
ODE
OpenNet Controller
Communication Selector DIP Switch
Set DIP switch 2 or 3 to ON to select user communi-
cation mode for RS232C port 1 or 2, respectively.
To RS232C Port 2
To RS232C Port 1
Pin
Cover
1
2
3
4
5
6
7
8
O N C
PEN ET ONTROLLER
OpenNet Controller
, use the modem cable 1C (FC2A-KM1C). To
To RS232C Port
Modem Cable 1C
FC2A-KM1C
D-sub 25-pin
3m (9.84 ft.) long
Male Connector
D-sub 25-pin Connector Pinouts
Pin
1
2
3
4
5
6
7
8
20
U ' M
SER S ANUAL
and another
OpenNet Controller
OpenNet Controller

Modem

Description
FG Frame Ground
TXD Transmit Data
RXD Receive Data
RTS Request to Send
— —
— —
SG Signal Ground
DCD Data Carrier Detect
DTR Data Terminal Ready
OpenNet Controller and
OpenNet Controller .
Open-
23-1