2 transmitting text data – KEYENCE Visual KV Series User Manual
Page 343
7.3 Loading Text Data
3-319
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7
Chapter 7 Serial Communication
Note 1: Be sure to transmit a break signal for the first serial communication with a
personal computer after the KV-P3E(01) handheld programmer is connected to the
KV, or after the "KV IncrediWare (DOS)" or "LADDER BUILDER for KV" program-
ming support software is evoked.
A break signal initializes the communication setting for the KV. If you cannot transmit
a break signal, turn the KV OFF once to initialize the communication setting. The KV
will not receive text data unless its communication setting has been initialized.
Note 2: If [ETX] exists at some point in the text data, the KV writes the data before
[ETX] into the data memory. The data after [ETX] is not written.
Note 3: If KV receives text data while special utility relay 2804 (2809)
*1
is ON, the
received data is not written into the data memory. In this case, special utility relay
2802 (2807)
*2
turns ON for one scan.
Note 4: When parity errors or other errors occur during text data reception, the
received data is not written into the data memory. In this case, special utility relays
2802 (2807) and 2803 (2808)
*3
turn ON for one scan.
Note 5: The KV-10xx includes only communication port A.
*1: 2804 with KV-300/10/80 *2: 2805 with KV-300/10/80 *3: 2806 with KV-300/10/80
7.3.2
Transmitting Text Data
The KV transmits text data written into its data memories (DM1100 to DM1199 for
communication port A, DM1300 to DM1399 for communication port B), one byte per
data memory in ASCII code.
Transmission data format and internal data memories
When transmitting data from the KV, write the data into the data memory in the
following format.
The KV writes "00" into the high-order 8 bits and text data in ASCII code into the
low-order 8 bits of the data memory.
Note: The KV-10xx includes only communication port A.
Data 99
Data memory bits
High-order 8 bits (00)
Low-order 8 bits (ASCII code)
Data memory
1st DM
(Byte count of data)
2nd DM
3rd DM
4th DM
100th DM
Transmitted data
Data 1 Data 2 Data 3
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1
KVNKA Chap 07.p65
08.3.11, 0:11 PM
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