iTRANS 2
FIXED POINT SINGLE OR DUAL GAS MONITOR
WITH DUAL ANALOG OUTPUTS
USER MANUAL
Revision 7.0
6.4 ModBus Resources
ModBus is a public protocol that can be freely adopted by any developer or manufacturer
desiring to implement it. While a detailed discussion of ModBus protocol is beyond the scope of
this manual, there are a number of up-to-date resources available on the internet for those wishing
to investigate ModBus further. The most complete resource is www.modbus.org.
6.5 Termination
When putting devices on the ModBus network, a terminating resistor may be required for the last
device on the network (please see www.modbus.org for more details). The has a
blue jumper on the “public” jumper that can be used to jumper in a 120-Ohm terminating resistor.
By default, this jumper is not in place. TELEDYNE OLDHAM SIMTRONICS does not recommend
changing the placement of any of the other jumpers on this board.
Figure 6-2 Location of Jumpers
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