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USER'S GUIDE
VIDEO MODEM «OKO»
Terminal for connection
of the external devices
Power connector
RS232 connector
Fig. 19
3.15.1 External input (grey terminals):
Terminal 1: permanently connected with the case of the device and with the negative power lead.
Terminal 2: connected with + 5 V power lead through the reflector of the optoelectronic couple located
inside the device.
Terminals 1 and 2 are used for connecting ON/OFF sensor or guard loop with the resistance not
exceeding 2 KOhm.
To set ―NC/NO‖ state for the external sensor choose ―External signals‖ command from ―Coder‖ menu
(Fig. 2). The window, shown in Fig.18, appears on the screen.
When the checkbox ―Normally opened‖ is unchecked, this corresponds to the NC state of the sensor
(triggering will take place when the sensor circuit will be opened), when this checkbox is checked this
corresponds to the NO state of the sensor.
By the signal of the external sensor, actions described in p. 3.6 (Fig. 7) may be executed. Besides, the
external output can be switched over, i.e. an external actuating device, connected to the terminals 3
and 4 of the video modem, will be switched on.
3.15.2 External output (yellow terminals):
Terminal 3: in the ―opened‖ state connected to the receiver of the optoelectronic couple, in the ―closed‖
state connected with the case of the device and with the negative power lead.
Terminal 4: permanently connected with + 5 V power lead.
It is possible to connect an external device to terminals 3 and 4 with 5 V triggering voltage, input
current to be not greater than 60 mA.
ATTENTION! For switchover of devices with higher triggering parameters, use an external
electromagnetic relay.
Switchover (Fig. 18) takes place just after checking appropriate checkboxes.
3.16 Data transmission through the video modem
If you had connected with the video modem over the phone line, you can transfer data in duplex mode
through free RS232 port of the video modem.
Connect the second computer (hereafter as PC2) using null modem cable to RS232 port of the video
modem. On PC2 run any terminal program, for example windows 98 ―Hyper Terminal‖ (Start—
Programs—Accessories—Communications).
From the operator's PC (PC1) connect with the video modem (see p. 3.2).
From ―Coder‖ menu of the main window (Fig. 2) choose ―Settings‖ command. Set operating mode of
the RS232 port in ―Control‖ (see p. 3.4.3) and required baud rate for data transmission. Reboot the
video modem (see p. 3.4).
Connect to the video modem again. From ―Coder‖ menu choose ―Terminal‖ command. All the
characters, typed by you in opened ―Terminal‖ window, will be displayed in a terminal window on PC2
and vice versa, all the characters, typed in a terminal window on PC2, will be displayed in a terminal
window on PC1.
Instead of the computer, an actuating device, which understands the commands sent by you, may be
connected to RS232 port of the video modem. This device may be used, for instance, to control video
cameras.
ATTENTION! Data transmission baud rate set for RS232 port of the video modem must match
one, set in terminal program on PC2!
2002 LLC "Decima"
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