Table of Contents
Advertisement
1.11 RS-232C
With this unit, the output levels from the control signal output
terminal (TB1 on TERM board) can be switched to the EIA/TIA,
RS-232C compliant level using the switch S1 on the CPU board.
The RS-232C can be used to connect equipment such as a PC
(Personal Computer) but the connection requires that the con-
trol software is compatible with TK-AM200.
Camera
GND
TXD
RXD
When the camera and a PC are connected, both of them
are handled as DTE (Data Terminal Equipment). Therefore,
the PC should process the lines, which are not used by the
camera. Fig. 1-11 shows an example of such a connection,
where 4:DTR is looped back to 1:DCD and 6:DSR and 7:RTS
is looped back to 8:CTS. To set the connection properly it is
essential to be well acquainted with the connected PC, the
software, hardware and their respective manuals.
Fig. 1-11
Unlike the differential transmission of the RS-485 or RS-422,
the RS-232C connects the GND potentials of the camera and
connected equipment directly. As a result, if special care is not
taken in the system design of GND connection method, prob-
lems such as video noise derived from the GND loop may oc-
cur. In such a case, it is necessary to use an electrically isolated
interface in the RS-232C on the PC side.
1.12 COMMUNICATION LINE CONNECTION MODES
The JVC preset systems and their remote controllers perform
communications according to the JVC CCTV protocol (JCCP).
This protocol assumes four communication modes, and S2-1
and S2-2 on the CPU board are used to switch the protocol
according to the communication modes, which are described in
the following.
(1) Duplex (two-directional), point-to-point (1:1) connection mode
1
Four communication wires of TX+, TX–, RX+ and RX–
are used. Both the remote controller and camera send
or receive the commands.
1-6
PC (Dsub 9-pin)
1
CD (DCD)
2
RD (RXD)
3
SD (TXD)
4
ER (DTR)
5
SG (GND)
6
DR (DSR)
7
RS (RTS)
8
CS (CTS)
NC
9
RI
2
A set of circuit wires is distributed from the remote con-
troller to each camera.
3
There is no JVC remote controller, which supports this
communication mode at the present time (as of Febru-
ary 2000).
Camera
Camera
Fig. 1-12-1
(2) Simplex (unidirectional), point-to-point (1:1) connection mode
1
The TX+ and TX– terminals of the remote controller are
connected to the RX+ and RX– terminals of the camera
using two communication wires. The communication
occurs in a unidirectional manner only, from the remote
controller to the camera. The reliability of communica-
tion is inferior to that in mode (1).
2
In the same was as (1), a set of circuit wires are distrib-
uted from the remote controller to each camera.
3
There is no JVC remote controller at the present time
(as of February 2000) that supports this communication
mode.
(3) Duplex (two-directional), multi-drop (multi-point) connection
mode
1
Four communication wires of TX+, TX–, RX+ and RX–
are used. Both the remote controller and camera send
or receive the commands.
2
Multiple cameras (up to 32) share a set of circuit wires.
This sharing of a set of communication wires by multiple
cameras requires the camera ID setting (S3 and S4 on
CPU board) for the relevant identification between the
various cameras.
3
The RM-P2580 uses this connection mode.
4
Camera
Camera
Fig. 1-12-2
(4) Simplex (unidirectional), multi-drop (multi-point) connection
mode
1
The TX+ and TX– terminals of the remote controller are
connected to the RX+ and RX– terminals of the camera
using two communication wires.
2
Multiple cameras (up to 32) share a set of circuit wires.
3
There is no JVC remote controller at the present time
(as of February 2000) that supports this communication
mode.
4
4
Remote
controller
4
4
RM-P2580
Camera
Advertisement
Table of Contents
