Frame Structure; Command Frame Structure; List Of Services - Omron WT30 Operation Manual

Frame Structure

6-1

Frame Structure

6-1-1

Command Frame Structure

Unit No.
STX 0
1 2
6-1-2

List of Services

76
CompoWay/F is used as the communications protocol. Command frames are
sent to the WT30 from the host, these commands are processed by the
WT30, and response frames are returned to the host.
Addresses, response codes, and end codes are all expressed in hexadecimal.
If a value is followed by H (e.g., 02H), the value is a hexadecimal number. Val-
ues expressed as normal numerical values are in ASCII. The values under the
frame are the numbers of bytes.
Text
Subaddress SID
0 0 0 0
2 1
BCC calculation range
STX
Unit No.
Subaddress
SID (Service ID)
Command text
ETX
BCC
MRC SRC
Read Variable Area
01 01
Write Variable Area
01 02
05 01 Read Controller Data
Read Machine Attributes
05 03
Read Controller Status
06 01
Echoback Test
08 01
Operation Commands
30 05
Command text
MRC SRC
Data
A code, 02 hex, indicating the beginning of a communications
frame (text). This code must always be set as the first byte.
When STX is received again during reception, reception is
executed again from the point where STX was received.
Identifies the unit number (UNIT No.) of the Serial Master Sta-
tion.
• A BCD value between 00 to 99 can be set.
• No response will be returned for stations with unit numbers
outside the above range.
Always set to 00.
Always set to 0.
Application layer (service request/response PDU).
MRC Indicates the main request code. Refer to 6-1-2 List
of Services on page 76.
SRC Indicates the sub request code. Refer to 6-1-2 List of
Services on page 76.
A code, 03 hex, indicating the end of text.
The block check character. The value is an exclusive OR of all
data from the unit number to the ETX for each byte.
Name of service
This service reads from variable areas.
This service writes to variable areas.
This service reads the model number
and version codes.
This service reads the model number
and communications buffer size.
This service reads the operating status.
This service performs an echoback
test.
This service performs operations such
as software resets.
Section 6-1
BCC
ETX
1 1
Processing