From ff25699ae2f5cec72b263e1960c96d00b23bf6fc Mon Sep 17 00:00:00 2001
From: svchao <shan_cando@163.com>
Date: Fri, 17 Dec 2021 13:59:08 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=95=B0=E6=8D=AE=E4=BD=8D9?=
 =?UTF-8?q?=E7=9A=84=E6=94=AF=E6=8C=81?=
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---
 src/modbus-rtu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/modbus-rtu.c b/src/modbus-rtu.c
index a25b965..4523622 100644
--- a/src/modbus-rtu.c
+++ b/src/modbus-rtu.c
@@ -693,7 +693,7 @@ static int _modbus_rtu_connect(modbus_t *ctx)
     tios.c_cflag |= (CREAD | CLOCAL);
     /* CSIZE, HUPCL, CRTSCTS (hardware flow control) */
 
-    /* Set data bits (5, 6, 7, 8 bits)
+    /* Set data bits (5, 6, 7, 8, 9, bits)
        CSIZE        Bit mask for data bits
     */
     tios.c_cflag &= ~CSIZE;
@@ -707,6 +707,9 @@ static int _modbus_rtu_connect(modbus_t *ctx)
     case 7:
         tios.c_cflag |= CS7;
         break;
+    case 9:
+        tios.c_cflag |= CS9;
+        break;
     case 8:
     default:
         tios.c_cflag |= CS8;