PyModbusでwrite_registerを行ったときの送信文や受信文の全文を調べたいです

例えば
req = client.write_register(address=int(ad,16),value=int(val,16),unit=int(sID,16))
としたとき、req.address, req.valueを用いてアドレス値やライト値しか引き出せないのでしょうか？
確認のため、送信したメッセージや返信されたメッセージの全文を[01,06,~~]のような配列でいただきたいのですが。。。

無理そうなのであればModbusプロトコルに沿った文を自分で作ってSerialを使って送るのが良いのでしょうか？

行動規範の内容に同意します

回答1件

ベストアンサー

req.address, req.valueのように簡単にメッセージフレーム全文を取得する手段はないようです。

確認さえできればいいということであれば、デバッグログに出力されていますのでそれを確認するという方法があります。
以下はModbus TCPでの通信ログの一例で、PyModbusの公式ドキュメントにある実装例を実行した結果です（クライアント側で出力されたログ）。
Docs » Examples » Synchronous Server Example
Docs » Examples » Synchronous Client Example

ログのフォーマットは変更できますので、自分が必要な情報だけに刈り込んで、もっと見やすくすることができます。

確認だけでは足りず、例えば [0, 1, 0, 0, 0, 6, 1, 1, 0, 1, 0, 1] といったPythonのオブジェクトが必要ということであれば、ログの中から "SEND: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x1 0x0 0x1 0x0 0x1" の部分を切り出して、そこから変換するプログラムを書く必要があります。

Python
12021-05-15 00:05:01,879 MainThread      DEBUG    sync           :215      Connection to Modbus server established. Socket ('127.0.0.1', 55338)
22021-05-15 00:05:01,879 MainThread      DEBUG    client         :24       Reading Coils
32021-05-15 00:05:01,879 MainThread      DEBUG    transaction    :138      Current transaction state - IDLE
42021-05-15 00:05:01,879 MainThread      DEBUG    transaction    :143      Running transaction 1
52021-05-15 00:05:01,879 MainThread      DEBUG    transaction    :269      SEND: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x1 0x0 0x1 0x0 0x1
62021-05-15 00:05:01,879 MainThread      DEBUG    sync           :76       New Transaction state 'SENDING'
72021-05-15 00:05:01,879 MainThread      DEBUG    transaction    :283      Changing transaction state from 'SENDING' to 'WAITING FOR REPLY'
82021-05-15 00:05:01,880 MainThread      DEBUG    transaction    :370      Changing transaction state from 'WAITING FOR REPLY' to 'PROCESSING REPLY'
92021-05-15 00:05:01,880 MainThread      DEBUG    transaction    :293      RECV: 0x0 0x1 0x0 0x0 0x0 0x4 0x1 0x1 0x1 0x0
102021-05-15 00:05:01,880 MainThread      DEBUG    socket_framer  :147      Processing: 0x0 0x1 0x0 0x0 0x0 0x4 0x1 0x1 0x1 0x0
112021-05-15 00:05:01,880 MainThread      DEBUG    factory        :266      Factory Response[ReadCoilsResponse: 1]
122021-05-15 00:05:01,880 MainThread      DEBUG    transaction    :449      Adding transaction 1
132021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :460      Getting transaction 1
142021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :222      Changing transaction state from 'PROCESSING REPLY' to 'TRANSACTION_COMPLETE'
152021-05-15 00:05:01,881 MainThread      DEBUG    client         :28       ReadCoilsResponse(8)
162021-05-15 00:05:01,881 MainThread      DEBUG    client         :30       Write to a Coil and read back
172021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :138      Current transaction state - TRANSACTION_COMPLETE
182021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :143      Running transaction 2
192021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :269      SEND: 0x0 0x2 0x0 0x0 0x0 0x6 0x1 0x5 0x0 0x0 0xff 0x0
202021-05-15 00:05:01,881 MainThread      DEBUG    sync           :76       New Transaction state 'SENDING'
212021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :283      Changing transaction state from 'SENDING' to 'WAITING FOR REPLY'
222021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :370      Changing transaction state from 'WAITING FOR REPLY' to 'PROCESSING REPLY'
232021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :293      RECV: 0x0 0x2 0x0 0x0 0x0 0x6 0x1 0x5 0x0 0x0 0xff 0x0
242021-05-15 00:05:01,881 MainThread      DEBUG    socket_framer  :147      Processing: 0x0 0x2 0x0 0x0 0x0 0x6 0x1 0x5 0x0 0x0 0xff 0x0
252021-05-15 00:05:01,881 MainThread      DEBUG    factory        :266      Factory Response[WriteSingleCoilResponse: 5]
262021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :449      Adding transaction 2
272021-05-15 00:05:01,881 MainThread      DEBUG    transaction    :460      Getting transaction 2
282021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :222      Changing transaction state from 'PROCESSING REPLY' to 'TRANSACTION_COMPLETE'
292021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :138      Current transaction state - TRANSACTION_COMPLETE
302021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :143      Running transaction 3
312021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :269      SEND: 0x0 0x3 0x0 0x0 0x0 0x6 0x1 0x1 0x0 0x0 0x0 0x1
322021-05-15 00:05:01,882 MainThread      DEBUG    sync           :76       New Transaction state 'SENDING'
332021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :283      Changing transaction state from 'SENDING' to 'WAITING FOR REPLY'
342021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :370      Changing transaction state from 'WAITING FOR REPLY' to 'PROCESSING REPLY'
352021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :293      RECV: 0x0 0x3 0x0 0x0 0x0 0x4 0x1 0x1 0x1 0x1
362021-05-15 00:05:01,882 MainThread      DEBUG    socket_framer  :147      Processing: 0x0 0x3 0x0 0x0 0x0 0x4 0x1 0x1 0x1 0x1
372021-05-15 00:05:01,882 MainThread      DEBUG    factory        :266      Factory Response[ReadCoilsResponse: 1]
382021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :449      Adding transaction 3
392021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :460      Getting transaction 3
402021-05-15 00:05:01,882 MainThread      DEBUG    transaction    :222      Changing transaction state from 'PROCESSING REPLY' to 'TRANSACTION_COMPLETE'
41（後略）