diff --git a/firmware/src/mmc3_m26_eth.v b/firmware/src/mmc3_m26_eth.v
index f29e3ad..e74d91b 100644
--- a/firmware/src/mmc3_m26_eth.v
+++ b/firmware/src/mmc3_m26_eth.v
@@ -1,4 +1,4 @@
-
+localparam VERSION = 8'd01;  
 
 module mmc3_m26_eth(
     input wire RESET_N,
@@ -341,6 +341,31 @@ localparam M26_RX_HIGHADDR = 32'ha00f-1;
 localparam GPIO_BASEADDR = 32'hb000;
 localparam GPIO_HIGHADDR = 32'hb01f;
 
+
+// VERSION READBACk
+reg [7:0] BUS_DATA_OUT_REG;
+always @ (posedge BUS_CLK) begin
+    if(BUS_RD) begin
+        if(BUS_ADD == 0)
+            BUS_DATA_OUT_REG <= VERSION[7:0];
+        //else if(BUS_ADD == 1)
+        //    BUS_DATA_OUT_REG <= VERSION[15:8];
+        //else if(BUS_ADD == 2)
+            //BUS_DATA_OUT_REG <= BOARD[7:0];
+        //else if(BUS_ADD == 3)
+            //BUS_DATA_OUT_REG <= BOARD[15:8];
+    end
+end
+
+reg READ_VER;
+always @ (posedge BUS_CLK)
+    if(BUS_RD & BUS_ADD < 2)
+        READ_VER <= 1;
+    else
+        READ_VER <= 0;
+
+assign BUS_DATA[7:0] = READ_VER ? BUS_DATA_OUT_REG : 8'hzz;
+
     
 // -------  USER MODULES  ------- //
 ///////////////////// M26 JTAG
diff --git a/pymosa/m26.py b/pymosa/m26.py
index 6ebdee0..9cbc365 100644
--- a/pymosa/m26.py
+++ b/pymosa/m26.py
@@ -65,6 +65,9 @@ class m26(Dut):
     Note:
     Setup run and trigger in configuration file (e.g. configuration.yaml)
     '''
+
+    VERSION = 1  # required version for mmc3_m26_eth.v
+
     def __init__(self, conf=None, context=None, socket_address=None):
         self.meta_data_dtype = np.dtype([('index_start', 'u4'), ('index_stop', 'u4'), ('data_length', 'u4'),
                                          ('timestamp_start', 'f8'), ('timestamp_stop', 'f8'), ('error', 'u4')])
@@ -91,11 +94,11 @@ def __init__(self, conf=None, context=None, socket_address=None):
     def init(self, **kwargs):
         super(m26, self).init()
 
-        # TODO: version control
-#         fw_version = self['intf'].read(0x2000, 1)[0]
-#         logging.info("MMC3 firmware version: %s" % (fw_version))
-#         if fw_version != self.VERSION:
-#             raise Exception("MMC3 firmware version does not satisfy version requirements (read: %s, require: %s)" % (fw_version, self.VERSION))
+        # check firmware version
+        fw_version = self['ETH'].read(0x0000, 1)[0]
+        logging.info("MMC3 firmware version: %s" % (fw_version))
+        if fw_version != self.VERSION:
+            raise Exception("MMC3 firmware version does not satisfy version requirements (read: %s, require: %s)" % (fw_version, self.VERSION))
 
         logging.info('Initializing %s', self.__class__.__name__)