Modbus Set Up - Teledyne T101 Operation Manual

Teledyne ML – T101 Operation Manual

4.7.9. MODBUS SET UP

Actions
Set C om Mode parameters
C omm
Slave ID
Reboot analyzer
Make appropriate cable
connections
Specify MODBUS software
settings
(examples used here are for
MODBUS Poll software)
Read the Modbus Poll
Register
The following set of instructions assumes that the user is familiar with MODBUS
communications, and provides minimal information to get started. For additional
instruction, please refer to the Teledyne ML MODBUS manual, PN 06276. Also refer to
www.modbus.org for MODBUS communication protocols.
Minimum Requirements
Instrument firmware with MODBUS capabilities installed.
•
MODBUS-compatible software (TML uses MODBUS Poll for testing; see
•
www.modbustools.com)
Personal computer
•
Communications cable (Ethernet or USB or RS232)
•
Possibly a null modem adapter or cable
•
Ethernet: Using the front panel menu, go to SETUP – MORE – C OMM – INET; scroll
through the INET submenu until you reach TCP PORT 2 (the standard setting is
502), then continue to TC P PORT 2 MODBUS TCP/IP; press EDIT and toggle the
menu button to change the setting to ON, then press ENTR. (Change Machine
ID if needed: see "Slave ID").
USB/RS232: Using the front panel menu, go to SETUP – MORE – C OMM – COM2 – EDIT;
scroll through the COM2 EDIT submenu until the display shows COM2 MODBUS
RTU: OFF (press OFF to change the setting to ON. Scroll NEXT to C OM2
MODBUS ASCII and ensure it is set to OFF. Press ENTR to keep the new
settings. (If RTU is not available with your communications equipment, set the
C OM2 MODBUS ASCII setting to ON and ensure that COM2 MODBUS RTU is set
to OFF. Press ENTR to keep the new settings).
If your analyzer is connected to a network with at least one other analyzer of the same
model, a unique Slave ID must be assigned to each. Using the front panel menu, go to
SETUP – MORE – C OMM – ID. The MACHINE ID default is the same as the model number.
Toggle the menu buttons to change the ID.
For the settings to take effect, power down the analyzer, wait 5 seconds, and power up the
analyzer.
C onnect your analyzer either:
via its Ethernet or USB port to a PC (this may require a USB-to-RS232 adapter for your PC;
•
if so, also install the sofware driver from the CD supplied with the adapter, and reboot the
computer if required), or
via its C OM2 port to a null modem (this may require a null modem adapter or cable).
•
C lick Setup / [Read / Write Definition] /.
1.
In the Read/Write Definition window (see example that follows) select a Function (what
a.
you wish to read from the analyzer).
Input Quantity (based on your firware's register map).
b.
In the View section of the Read/Write Definition window select a Display (typically Float
c.
Inverse).
C lick OK.
d.
Next, click C onnection/Connect.
2.
In the C onnection Setup window (see example that follows), select the options based on
a.
your computer.
Press OK.
b.
Use the Register Map to find the test parameter names for the values displayed (see example
that follows If desired, assign an alias for each.
Operating Instructions
119