IDEC FC6A-C16K1CE Communications Manual page 80

5: U C
SER OMMUNICATION
Transmit Data
Transmit data is designated by source device S1 using constant values or data registers. BCC code can also be calculated
automatically and appended to the transmit data. One TXD instruction can transmit a maximum of 1,536 bytes of data.
S1 (Source 1)
Transmit Data
Constant
(Character)
0-255
Constant
(Hexadecimal)
D0000-D7999
Data Register
D10000-D55999
BCC —
Note: Total byte count of the transmit data is shown in S1 of TXD instruction on the ladder diagram of WindLDR.
Designating Constant as S1
When a constant value is designated as source device S1, one-byte data is transmitted without conversion. The valid transmit data
value depends on the data bits selected in the Communication Parameters dialog box. These data bits are set in
, followed by selecting
Comm. Ports
data bits are selected as default, 00h through 7Fh is transmitted. When 8 data bits are selected, 00h through FFh is transmitted.
Constant values are entered in character or hexadecimal notation into the source data.
Constant (Character)
Any character available on the computer keyboard can be entered. One character is counted as one byte.
Constant (Hexadecimal)
Use this option to enter the hexadecimal code of any ASCII character. ASCII control codes NUL (00h) through US (1Fh) can also be entered using
this option.
Example:
The following example shows two methods to enter 3-byte ASCII data "1" (31h), "2" (32h), "3" (33h).
(1) Constant (Character)
(2) Constant (Hexadecimal)
5-4
I
NSTRUCTIONS
Device Conversion Type
No conversion
A: Binary to ASCII
B: BCD to ASCII
–: No conversion
A: Binary to ASCII
–: No conversion
User Protocol
FC6A S M S A
ERIES ICRO MART
Transmit Digits
(Bytes)
1
1-4
1-5
1-2
1-2
in Port 1 through Port 3 list box and clicking the
- -O T C
LL IN NE YPE OMMUNICATION
Repeat BCC Calculation
— —
1-99 —
X: XOR
A: ADD
— C: Add-2comp
M: Modbus ASCII
M: Modbus RTU
Configure
M FC9Y-B1730
ANUAL
Calculation
Start Position
—
—
1-15
>
Configuration
button. When 7