diff --git a/src/libboard_artiq/src/cxp_upconn.rs b/src/libboard_artiq/src/cxp_upconn.rs
index 2dc484c..db38bc9 100644
--- a/src/libboard_artiq/src/cxp_upconn.rs
+++ b/src/libboard_artiq/src/cxp_upconn.rs
@@ -15,7 +15,7 @@ pub fn tx_test(channel: usize, timer: &mut GlobalTimer) {
 
         (CXP[channel].upconn_tx_enable_write)(1);
         timer.delay_us(2); // send one word
-        cxp_proto::read_u32(channel, 0x00).expect("Cannot Write CoaXpress Register");
+        // cxp_proto::read_u32(channel, 0x00).expect("Cannot Write CoaXpress Register");
         // cxp_proto::write_u64(channel, 0x00, 0x01);
         // cxp_proto::send(channel, &cxp_proto::Packet::EventAck { packet_tag: 0x04 }).expect("Cannot send CoaXpress packet");
         // cxp_proto::send(channel, &cxp_proto::Packet::TestPacket).expect("Cannot send CoaXpress packet");