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270
RS-232C Units
Section 6-2
RS-232C Unit Explicit
Message List
The explicit messages that can be processed by the RS-232C Unit are as
listed in the following table. For the RS-232C Unit, the service code and the
Instance ID determine the processing content and object. The Class ID is
always 0094 Hex.
Note
The parentheses indicate the response values.
Explicit Message Format
This section explains the common features of explicit commands and
responses. Details and usage examples will only be provided however, for
those explicit messages that the RS-232C Unit can process. For details on
using explicit messages with a Master Unit, refer to the
DeviceNet Operation
Manual
.
The number of bytes designated for Class ID, Instance ID, and Attribute ID
differ depending on the Master. When sent from an OMRON DeviceNet Mas-
ter, Class ID and Instance ID are 2 bytes (4 digits), and Attribute ID is 1 byte
(2 digits). For an example using this case, see
6-2-8 Using Explicit DeviceNet
Messages
.
Command Block
Destination Node Address
The node address of the RS-232C Unit controlled by the explicit message
(command) in single-byte (2-digit) hexadecimal.
Explicit
message
Function
Service code
(See note)
Instance ID
Page
PARAMETER
SET
Sets the parame-
ters for an
RS-232C port.
10 Hex (90 Hex)
01 Hex
272
PARAMETER
READ
Reads the parame-
ters set for an
RS-232C port.
0E Hex (8E Hex)
01 Hex
275
INITIALIZE
PARAMETERS
Initializes the
parameters for an
RS-232C port.
05 Hex (85 Hex)
01 Hex
276
RS-232C DATA
SEND
Transmits data
from an
RS-232C port.
10 Hex (90 Hex)
Port 1: 02 Hex
Port 2: 03 Hex
276
RS-232C
RECEIVE DATA
READ
Reads data
received by an
RS-232C port.
0E Hex (8E Hex)
Port 1: 02 Hex
Port 2: 03 Hex
277
PORT RESET
Resets an
RS-232C port.
05 Hex (85 Hex)
Port 1: 02 Hex
Port 2: 03 Hex
278
Error response
When an error
occurs in an
explicit message
(command), an
error response is
sent from the
RS-232C Unit.
--- (94 Hex)
---
279
Attribute
ID
Class ID
Service Code
00
94
Instance ID
151 bytes max.
Data
Destination
node address
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