diff --git a/site_ansto/hardsup/omron_asyncprotocol.c b/site_ansto/hardsup/omron_asyncprotocol.c
index 05d6556c..dfea149e 100644
--- a/site_ansto/hardsup/omron_asyncprotocol.c
+++ b/site_ansto/hardsup/omron_asyncprotocol.c
@@ -120,9 +120,7 @@ static int OMRON_PrepareTxn(pAsyncProtocol p, pAsyncTxn txn, const char* cmd, in
   txn->out_buf[0] = STX;
   txn->out_buf[cmd_len + 1] = ETX;
   txn->out_buf[cmd_len + 2] = calc_bcc(txn->out_buf);
-  txn->out_buf[cmd_len + 3] = 0x0D;
-  txn->out_buf[cmd_len + 4] = 0x0A;
-  txn->out_len = cmd_len + 5;
+  txn->out_len = cmd_len + 3;
   return 1;
 }