MODBUS bugfixes, utilize new types file

scada-common/types.lua

@@ -18,3 +18,32 @@ iss_status_t = {
     no_coolant = "no_coolant",
     timeout = "timeout"
 }
+
+-- MODBUS
+
+-- modbus function codes
+local MODBUS_FCODE = {
+    READ_COILS = 0x01,
+    READ_DISCRETE_INPUTS = 0x02,
+    READ_MUL_HOLD_REGS = 0x03,
+    READ_INPUT_REGS = 0x04,
+    WRITE_SINGLE_COIL = 0x05,
+    WRITE_SINGLE_HOLD_REG = 0x06,
+    WRITE_MUL_COILS = 0x0F,
+    WRITE_MUL_HOLD_REGS = 0x10,
+    ERROR_FLAG = 0x80
+}
+
+-- modbus exception codes
+local MODBUS_EXCODE = {
+    ILLEGAL_FUNCTION = 0x01,
+    ILLEGAL_DATA_ADDR = 0x02,
+    ILLEGAL_DATA_VALUE = 0x03,
+    SERVER_DEVICE_FAIL = 0x04,
+    ACKNOWLEDGE = 0x05,
+    SERVER_DEVICE_BUSY = 0x06,
+    NEG_ACKNOWLEDGE = 0x07,
+    MEMORY_PARITY_ERROR = 0x08,
+    GATEWAY_PATH_UNAVAILABLE = 0x0A,
+    GATEWAY_TARGET_TIMEOUT = 0x0B
+}