SMC Networks HRS090 Series, Operation Manual

Page: 68 / 84

HRX-OM-T004
Chapter 5 Simple communication protocol function
5.5 Message configuration HRS090 Series
5-12
5.5 Message configuration
The message
configuration
is shown in the following. The explanation of
data in message is shown in the Table 5.5-1.
This product communicates in ASCII mode. ASCII mode is used from STX
to ETX. Hexadecimal value is used for BCC.
5.5.1 Message format
1) Request message format
1-1) Request message (Request to read)
STX Slave Address Request Command ETX BCC
[STX]
XX XX
[R]
XX XX XX
[ETX]
XX
1-2) Request message (Request to write)
STX Slave Address Request Command Writing data ETX BCC
[STX]
XX XX
[W]
XX XX XX XX XX XX XX XX
[ETX]
XX
1-3) Request message (Request to store the data
）
STX Slave Address Request Command ETX BCC
[STX]
XX XX
[W]
XX XX XX
[ETX]
XX
2) Response message format
2-1) Response message (Normal response to request to write)
STX Slave Address ACK Command Reading data ETX BCC
[STX]
XX XX
[ACK]
XX XX XX XX XX XX XX XX
[ETX]
XX
2-2) Response message (Normal response to request to write or store the data)
STX Slave Address ACK ETX BCC
[STX]
XX XX
[ACK] [ETX]
XX
2-3) Response message (Response when a receiving error occurred)
STX Slave Address NAK ETX BCC
[STX]
XX XX
[NAK]
XX
[ETX]
XX
Response is not returned unless STX and ETX (BCC) are included in the request. This product clears all
previously received code when STX is received.
Exception code