Teledyne T100 Manuale Utente

145 

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 API MODBUS manual, PN 06276. Also refer to 
www.modbus.org for MODBUS communication protocols. 

 

Instrument firmware with MODBUS capabilities installed. 

 

MODBUS-compatible software (TAPI 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 

Set Com Mode parameters 

Comm 

 
 
 
 
 
 
 

 

 Slave ID 

 

Ethernet:      Using the front panel menu, go to SETUP – MORE – COMM – INET; scroll through the INET 

submenu until you reach TCP PORT 2 (the standard setting is 502), then continue to TCP 
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 – COMM – 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 COM2 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 COM2 MODBUS ASCII setting to ON and ensure that 
COM2 MODBUS RTU is set to OFF. Press ENTR to keep the new settings). 

 
A MODBUS slave ID must be set for each instrument.  Valid slave ID’s are in the range of 1 to 247.  If 
your analyzer is connected to a serial network (i.e., RS-485), a unique Slave ID must be assigned to each 
instrument. To set the slave ID for the instrument, go to SETUP – MORE – COMM – ID. The default 
MACHINE ID is the same as the model number. Toggle the menu buttons to change the ID.  

Reboot analyzer 

For the settings to take effect, power down the analyzer, wait 5 seconds, and power up the analyzer. 

Make appropriate cable 
connections 

Connect 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 software driver from the CD supplied with the adapter, and reboot the computer if required), or 

 

via its COM2 port to a null modem (this may require a null modem adapter or cable). 

Specify MODBUS software 
settings 
(examples used here are for 
MODBUS Poll software) 

1. 

Click Setup / [Read / Write Definition] /. 

a. 

In the Read/Write Definition window (see example that follows) select a Function  (what you wish 
to read from the analyzer).  

b. 

Input Quantity (based on your firmware’s register map). 

c. 

In the View section of the Read/Write Definition window select a Display (typically Float Inverse).  

d. 

Click OK.  

2. 

Next, click Connection/Connect. 

a. 

In the Connection Setup window (see example that follows), select the options based on your 
computer. 

b. 

Press OK. 

Read the Modbus Poll Register  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. 

Example Read/Write Definition window: 

06807C DCN6650