test code that works for checking cable

modbus_get.py

@@ -0,0 +1,80 @@
+#!/usr/bin/env python
+# scripts/examples/simple_tcp_client.py
+import fcntl
+import sys
+import socket
+import struct
+from serial import Serial
+from serial.serialutil import SerialException
+from umodbus.client.serial import rtu
+import json
+
+s = Serial('/dev/ttyUSB0',19200)
+try:
+    s.open()
+except SerialException:
+    print('already open')
+
+BOOLEAN=1000
+FLOAT=500
+INT=1250
+try:
+    res = {'A':{},'D':{},'I':{}}
+
+    # digital - boolean
+    req_adu = rtu.read_coils(
+        slave_id=1,
+        starting_address=1,
+        quantity=1)
+
+    resp = rtu.send_message(req_adu, s)
+
+    address = -1
+    try:
+        for address in range(0, BOOLEAN, 1):
+            res['D'][address+1] = (resp[address] > 0)
+    except KeyError as e:
+        print(e)
+        res['D'][address] = False
+    except IndexError:
+        print(address)
+
+    # analog - float
+    for address in range(0, FLOAT, 125):
+        req_adu = rtu.read_holding_registers(
+            slave_id=1,
+            starting_address=1+address,
+            quantity=125)
+
+        resp = rtu.send_message(req_adu, s)
+
+        for n in range(125):
+            try:
+                res['A'][address + n] =  int(resp[n]) / 10
+            except Exception as e:
+                print(e)
+                res['A'][address + n] = 0.
+            #res['A'][ str(address + var) ] = int(resp[var]) / 10.
+
+    # integer - int
+    for address in range(1, INT, 125):
+        req_adu = rtu.read_coils(
+            slave_id=1,
+            starting_address=address+5002,
+            quantity=125)
+
+        resp = rtu.send_message(req_adu, s)
+
+        for n in range(125):
+            try:
+                res['I'][address + n] = int(resp[n])
+            except KeyError as e:
+                print(e)
+                res['I'][address + n] = 0
+except KeyboardInterrupt:
+    print("Quitting")
+    pass
+
+s.close()
+
+sys.exit(0)