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RS-232C Units Section 6-2
Response Block
Parameters
Instance ID (Command)
Specifies the port to be reset, in hexadecimal as follows:
02 Hex: Port 1
03 Hex: Port 2
Note 1. When the port is reset, the transmission buffer and the reception buffers
are cleared and the port’s status is initialized. The parameter settings,
however, are maintained.
2. When an error occurs at a port, find the cause of the error and then use
this command to reset the port.
Error Response If there is an error in the explicit command, the RS-232C Unit will return an
error response as illustrated below.
Response Block
Parameters
No. of Received Bytes (Response)
Always 0004 Hex.
Source Node Address (Response)
The node address of the node that sent the command is returned in hexadec-
imal.
Error Code (Response)
The error code is returned in double-byte (4-digit) hexadecimal, as shown in
the following table.
No. of received
bytes
Source node address
Service code
Error code Error details Appropriate command
02FF Hex The RS-232C port is transmitting
data and therefore busy.
RS-232C DATA SEND
08FF Hex The service code, Class ID, and
Instance ID are not supported.
All commands
09FF Hex Data formatting error. PARAMETER SET
RS-232C DATA SEND
1800 Hex There is no receive data at the
RS-232C port.
There is a parameter setting error
between RS-232C devices.
RS-232C RECEIVE DATA READ
No. of received
bytes
Source node address
Error code
Service code
(94 Hex: fixed)
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