diff --git a/src/libboard_artiq/src/cxp_proto.rs b/src/libboard_artiq/src/cxp_proto.rs
index 51cbe23..fb4eed9 100644
--- a/src/libboard_artiq/src/cxp_proto.rs
+++ b/src/libboard_artiq/src/cxp_proto.rs
@@ -6,8 +6,7 @@ use crc::crc32::checksum_ieee;
 use io::Cursor;
 use libboard_zynq::println;
 
-const EV_MAXSIZE: usize = 253;
-const CTRL_PACKET_MAXSIZE: usize = 128; // for compatibility with version1.x compliant Devices - Section 12.1.6 (CXP-001-2021)
+pub const CTRL_PACKET_MAXSIZE: usize = 128; // for compatibility with version1.x compliant Devices - Section 12.1.6 (CXP-001-2021)
 pub const DATA_MAXSIZE: usize =
     CTRL_PACKET_MAXSIZE - /*packet start KCodes, data packet types, CMD, Tag, Addr, CRC, packet end KCode*/4*7;
 
@@ -165,7 +164,7 @@ pub enum RXPacket {
         namespace: NameSpace,
         event_id: u16,
         timestamp: u64,
-        ev: [u8; EV_MAXSIZE],
+        ev: [u8; DATA_MAXSIZE],
     },
 }
 
@@ -239,7 +238,7 @@ impl RXPacket {
 
         let timestamp = reader.read_u64()?;
 
-        let mut ev: [u8; EV_MAXSIZE] = [0; EV_MAXSIZE];
+        let mut ev: [u8; DATA_MAXSIZE] = [0; DATA_MAXSIZE];
         reader.read(&mut ev[0..ev_size as usize])?;
 
         let checksum = get_cxp_crc(&reader.get_ref()[0..reader.position()]);