From a0aa885d0175311ef9e77fdade59cb9b0f3f8cf2 Mon Sep 17 00:00:00 2001
From: Michael Haberler <git@mah.priv.at>
Date: Mon, 27 Feb 2012 22:43:18 +0100
Subject: [PATCH] serial_mode isn't a bitmask

---
 src/modbus-rtu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/modbus-rtu.c b/src/modbus-rtu.c
index d842b7c..47c3421 100644
--- a/src/modbus-rtu.c
+++ b/src/modbus-rtu.c
@@ -826,7 +826,7 @@ int modbus_rtu_set_serial_mode(modbus_t *ctx, int mode)
                 return -1;
             }
 
-            ctx_rtu->serial_mode |= MODBUS_RTU_RS485;
+            ctx_rtu->serial_mode = MODBUS_RTU_RS485;
             return 0;
         } else if (mode == MODBUS_RTU_RS232) {
             if (ioctl(ctx->s, TIOCSRS485, &rs485conf) < 0) {
--
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