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Other Information
External Control
These specifications cover the communications control of the monitor by
external control. Connections are made as follows:
1. The connector on the monitor side is the EXTERNAL CONTROL connector
(an illustration of the pin assignment is on the right).
2. The connector on the external equipment side is a serial port (RS-232C)
connector. See the specifications of the external equipment to be connected
for the type of connector and pin assignment.
3. Wiring: Use a crossed (reverse) cable).
Wire the cable so that each pair of data lines cross between the monitor and
the external control device. The data line pairs are RXD (recieve data) and
TXD (transmit data), DTR (DTE side ready), and RTS (ready to send) and CTS
((clear to send).
Communication Parameters
(1) Communication System
(2) Interface
(3) Baud rate
(4) Data length
(5) Parity
(6) Stop bit
(7) Communication code
Communication Format
Command 1 and Command 2
Command 1 and command 2 are numbers used to distinguish each command.
In case of ACK, when the lower order 4 bits is FH (as in 3FH and 7 FH), this
indicates that the commands and data of the supported equipment have been
received. When the lower order of 4 bits is BH (as in 3 BH and 7 BH), this
indicates that unsupported commands and data have been received.
Unit ID 1 and Unit ID 2
Unit ID 1 and Unit ID 2 are sued to identify the equipment that is to be connected. 60H is used for the monitor and 80H is used
for the external control equipment (i.e., a personal computer).
Unit ID 1 indicates the equipment is sending the signal.
Unit ID 2 indicates the equipment is receiving the signal.
Check Sum (CKS) Error Processing, and ACK
The check sum and RS-232C odd parity are used together for a check of the received data. The check sum is the lower order 8 bits
of one frame or sent or received data comprising the sum total of Command 1, Unit ID 1 and 2, Data Length, and Data.
Error Processing
• If the communication interval is vacant for more than 4 ms, a received Command 1 will be recognized. Then, if meaningful data
cannot be recognized, the data will not be recognized as valid.
• An ACK will not be returned unless the receive data error, the check sum error and the receive data are all taken in.
DFH
80H
60H
47H
Command 1 Unit ID 1 Unit ID 2 Command 2 Data Length Data Check Sum
Total 208H
38
Asynchronous
RS-232C
9600 bps
8 bits
Odd
1 bit
Hex
01H
01H
08H
Type of connector: D-sub 9 Pin Male
1
2
3
4
7
8
9
6
Pin No.
PIN NAME
1
No Connection
2
RXD (Receive data)
3
TXD (Transmit data)
4
DTR (DTE side ready)
5
GND
6
DSR (DCE side ready)
7
RTS (Ready to send)
8
CTS (Clear to send)
9
No connection
5
Chapter 3
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