diff --git a/artiq/firmware/satman/jdac_requests.rs b/artiq/firmware/satman/jdac_requests.rs
new file mode 100644
index 000000000..2ba120ebb
--- /dev/null
+++ b/artiq/firmware/satman/jdac_requests.rs
@@ -0,0 +1,4 @@
+pub const INIT: u8              = 0x00;
+pub const PRINT_STATUS: u8      = 0x01;
+pub const PRBS: u8              = 0x02;
+pub const STPL: u8              = 0x03;
diff --git a/artiq/firmware/satman/jdcg.rs b/artiq/firmware/satman/jdcg.rs
index 278fcb775..f7bdd8f90 100644
--- a/artiq/firmware/satman/jdcg.rs
+++ b/artiq/firmware/satman/jdcg.rs
@@ -1,6 +1,8 @@
 use board_misoc::{csr, clock};
 use board_artiq::drtioaux;
 
+use super::jdac_requests;
+
 pub fn jesd_reset(reset: bool) {
     unsafe {
         csr::jesd_crg::jreset_write(if reset {1} else {0});
@@ -67,17 +69,17 @@ pub fn init() {
         jesd_prbs(dacno, false);
         jesd_stpl(dacno, false);
 
-        jdac_basic_request(dacno, 0);
+        jdac_basic_request(dacno, jdac_requests::INIT);
 
         jesd_prbs(dacno, true);
-        jdac_basic_request(dacno, 2);
+        jdac_basic_request(dacno, jdac_requests::PRBS);
         jesd_prbs(dacno, false);
 
         jesd_stpl(dacno, true);
-        jdac_basic_request(dacno, 3);
+        jdac_basic_request(dacno, jdac_requests::STPL);
         jesd_stpl(dacno, false);
 
-        jdac_basic_request(dacno, 0);
+        jdac_basic_request(dacno, jdac_requests::INIT);
 
         let t = clock::get_ms();
         while !jesd_ready(dacno) {
@@ -87,7 +89,7 @@ pub fn init() {
             }
         }
         clock::spin_us(5000);
-        jdac_basic_request(dacno, 1);
+        jdac_basic_request(dacno, jdac_requests::PRINT_STATUS);
 
         if !jesd_jsync(dacno) {
             error!("bad SYNC");
diff --git a/artiq/firmware/satman/main.rs b/artiq/firmware/satman/main.rs
index 9c8e32c93..c08e1b605 100644
--- a/artiq/firmware/satman/main.rs
+++ b/artiq/firmware/satman/main.rs
@@ -17,6 +17,8 @@ use board_artiq::hmc830_7043;
 mod repeater;
 #[cfg(has_jdcg)]
 mod jdcg;
+#[cfg(any(has_ad9154, has_jdcg))]
+pub mod jdac_requests;
 
 fn drtiosat_reset(reset: bool) {
     unsafe {
@@ -299,10 +301,10 @@ fn process_aux_packet(_repeaters: &mut [repeater::Repeater],
                 #[cfg(rtio_frequency = "150.0")]
                 const LINERATE: u64 = 6_000_000_000;
                 match _reqno {
-                    0 => board_artiq::ad9154::setup(_dacno, LINERATE).is_ok(),
-                    1 => { board_artiq::ad9154::status(_dacno); true },
-                    2 => board_artiq::ad9154::prbs(_dacno).is_ok(),
-                    3 => board_artiq::ad9154::stpl(_dacno, 4, 2).is_ok(),
+                    jdac_requests::INIT => board_artiq::ad9154::setup(_dacno, LINERATE).is_ok(),
+                    jdac_requests::PRINT_STATUS => { board_artiq::ad9154::status(_dacno); true },
+                    jdac_requests::PRBS => board_artiq::ad9154::prbs(_dacno).is_ok(),
+                    jdac_requests::STPL => board_artiq::ad9154::stpl(_dacno, 4, 2).is_ok(),
                     _ => false
                 }
             };