23.4 Standard Type Protocol
23-15
23.4.2 Protocol Contents
Transmission Control Code
The transmission control codes are shown in the table below.
Port Number
Port numbers can be set for connection mode “1 : n”.
They are used so that the host computer can identify each S8 series for access.
The data range is from 00H to 1FH (0 to 31) and is converted into a two-digit ASCII code (HEX) before use. Set port numbers
of the S8 series at [Local Port No.] in the [Communication Setting] tab window.
Global port number (FFH)
When the global port number [FFH] is set, commands are send to all S8 series units at one time.
Commands for which global port numbers are active are shown below. If commands other than these are used, a command
error will occur.
Responses to global port numbers are not transmitted to the host. However, responses are written in write area n + 8.
Command
Available commands are shown below. The details on commands are described on pages shown at “Refer to:”.
Signal Name
Code (Hexadecimal)
Contents
STX
02H
Start of transmission block
ETX
03H
End of transmission block
ENQ
05H
Interrupt
ACK
06H
Positive acknowledge
CR
0DH
Carriage return
DLE
10H
Change contents within a block
NAK
15H
Negative acknowledge
LF
0AH
Line feed
Signal Name
Name
Contents
WM
Write
Write data memory
WC
Write CHR
Write data memory as characters
Memory Contents
Contents
0000H
Global command not received
0100H
ACK
Others
Identical to NAK code (see page 23-16.)
Signal
Name
Name
Contents
Refer to:
RM
Read
Read data memory
page 23-19
WM
Write
Write data memory (512 words maximum)
page 23-21
TR
Retry
Retry when NAK [01] is BUSY
page 23-22
WI
Interrupt Setting
Allow interrupt (Connection mode 1 : 1)
page 23-23
RI
Read interrupt status
Read interrupt setting status (Connection mode 1 : 1)
page 23-24
RC
Read CHR
Read data memory as characters
page 23-18
WC
Write CHR
Write data memory as characters (1024 bytes maximum)
page 23-20
Содержание Monitouch S8 series
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