diff --git a/rtu/startup.lua b/rtu/startup.lua
index 59bc477..6a21753 100644
--- a/rtu/startup.lua
+++ b/rtu/startup.lua
@@ -72,9 +72,9 @@ for reactor_idx = 1, #rtu_redstone do
         local config = io_table[i]
 
         -- verify configuration
-        if is_valid_channel(config.channel) and is_valid_side(config.side) then
+        if rsio.is_valid_channel(config.channel) and rsio.is_valid_side(config.side) then
             if config.bundled_color then
-                valid = is_color(config.bundled_color)
+                valid = rsio.is_color(config.bundled_color)
             else
                 valid = true
             end
@@ -115,7 +115,7 @@ for reactor_idx = 1, #rtu_redstone do
         reactor = rtu_redstone[reactor_idx].for_reactor,
         device = capabilities,  -- use device field for redstone channels
         rtu = rs_rtu,
-        modbus_io = modbus_init(rs_rtu)
+        modbus_io = modbus.new(rs_rtu)
     })
 end
 
@@ -158,7 +158,7 @@ for i = 1, #rtu_devices do
                 reactor = rtu_devices[i].for_reactor,
                 device = device,
                 rtu = rtu_iface,
-                modbus_io = modbus_init(rtu_iface)
+                modbus_io = modbus.new(rtu_iface)
             })
 
             log._debug("init> initialized RTU unit #" .. #units .. ": " .. rtu_devices[i].name .. " (" .. rtu_type .. ") [" ..
@@ -211,7 +211,7 @@ while true do
                     unit.rtu = imatrix_rtu(device)
                 end
 
-                unit.modbus_io = modbus_init(unit.rtu)
+                unit.modbus_io = modbus.new(unit.rtu)
 
                 println_ts("reconnected the " .. unit.type .. " on interface " .. unit.name)
             end
diff --git a/scada-common/modbus.lua b/scada-common/modbus.lua
index dc73e64..b192cc9 100644
--- a/scada-common/modbus.lua
+++ b/scada-common/modbus.lua
@@ -26,7 +26,7 @@ local MODBUS_EXCODE = {
 }
 
 -- new modbus comms handler object
-function modbus_init(rtu_dev)
+function new(rtu_dev)
     local self = {
         rtu = rtu_dev
     }
diff --git a/scada-common/ppm.lua b/scada-common/ppm.lua
index 3eb3977..f11f0e2 100644
--- a/scada-common/ppm.lua
+++ b/scada-common/ppm.lua
@@ -102,7 +102,7 @@ function mount_all()
             dev = pm_dev
         }
 
-        log._debug("PPM: found a " .. self.mounts[ifaces[i]].type)
+        log._debug("PPM: found a " .. self.mounts[ifaces[i]].type .. " (" .. ifaces[i] .. ")")
     end
 
     if #ifaces == 0 then