diff --git a/src/modules/px4iofirmware/sbus.c b/src/modules/px4iofirmware/sbus.c
index 8ed69678c1..0e7dc621cf 100644
--- a/src/modules/px4iofirmware/sbus.c
+++ b/src/modules/px4iofirmware/sbus.c
@@ -119,19 +119,13 @@ sbus_init(const char *device)
 bool
 sbus1_output(uint16_t *values, uint16_t num_values)
 {
-    // FIXME: I assume this was previously NYI?
-    ssize_t cBytes = num_values * sizeof(values[0]);
-	ssize_t cBytesWritten = write(sbus_fd, values, cBytes);
-    return cBytesWritten == cBytes;
+	write(sbus_fd, 'A', 1);
 }
 
 bool
 sbus2_output(uint16_t *values, uint16_t num_values)
 {
-    // FIXME: I assume this was previously NYI?
-    ssize_t cBytes = num_values * sizeof(values[0]);
-	ssize_t cBytesWritten = write(sbus_fd, values, cBytes);
-    return cBytesWritten == cBytes;
+	write(sbus_fd, 'B', 1);
 }
 
 bool