Alarm Output Block; External Rs-232 Communication Block; Camera Block Interface Connector Block; Led Circuit - Sony SNC-Z20N Service Manual

4-3-15. Alarm Output Block

The alarm output circuit inputs the relay control signals
(RELAY0 and RELAY1), sent from Main CPU (IC606), to
two relays (RY801 and RY802) and turns on and off the
switch inside the relays.
The relay output signal can control the external device by
connecting with an external device from the screwless
terminal board connector of CN2.
4-3-16. External RS-232 Communication
Block
The external RS-232 communication block communicates
with the outside through an RS-232 driver circuit (IC802)
using communication control signals (EXT_TXD and
EXT_RXD) from Main CPU (IC606) by RS-232C. This
communication block can communicate in serial with the
external equipment when it is connected with external
equipment from the terminal board connector of CN2.
4-3-17. Camera Block Interface Connector
Block
CN701 (pin 22) is used to connect the digital image data
and control signal from the camera block.
CN804 (pin 21) is used to connect the power supply (10 V
DC) to the camera block, the VISCA communication
signal with the camera block, and the analog video signal
from the camera block.

4-3-18. LED Circuit

LED control signals outputted from Main CPU (IC606)
make NETWORK indicator and POWER indicator turn on
and off.
NETWORK indicator (D701 and D703) shows the
connection state of the network.
. When D701 (green) is on:
. When D703 (orange) is on:
. When the both of LEDs are not on:
POWER indicator (D702) shows the power supply state
and operating mode.
. When D702 (green) is on:
. When D702 (green) is blinking: Power ON, Test mode
. When D702 (green) is not on: Power OFF
SNC-Z20N/Z20P (E)
Connect by 100BASE-TX
Connect by 10BASE-T
Un-connect with a network
Power ON, Normal mode

4-4. CT-229 Board

The 24 VAC/12 V DC power input terminal, BNC
connector for video signal output and push switches for
zoom lens operation (WIDE and TELE) are contained on
the CT-229 board.
4-5