ATI Series D12 Toxic Gas Transmitter with H10 Smart Sensor
Revision N (7/15) 71
Modbus
Modbus is a master/slave protocol that supports a single master, and up to 247 slave devices on a
common bus. The RS485 interface physically limits this number to 32 (1 master, 31 slaves), and
RS232 restricts communication to a master and a single slave. The Communication Setup page may be
used to configure the interface, baud rate, and communication variables. See Modbus RS485 Multi-
drop and Computer RS232 for connection details.
When the Modbus protocol driver is installed, a link to the Modbus Setup page appears on the main
Setup page.
Figure 74. Modbus setup page
Table 20. Modbus setup variables
Slave_Addr
The Slave_Addr variable is the transmitter’s slave address, which may set from 1
(default) to 247.
Time_Out
The Time_Out variable belongs to the data-link layer of the protocol and defines
the number of 1.5 character timeouts used to frame messages. This variable is
reserved for future use and changing it is not recommended.
Transmitter Version
The Transmitter Version page displays transmitter information:
Line 1: model and version name
Line 2: protocol option (if any)
Line 3: hardware and software version numbers
Line 4: software build date
Figure 75. Transmitter version page
Modbus Setup
►Slave_Addr=1
Time_Out= 3
>Menu >Setup >Modbus
Sensor DataLog
Alarms Display
Auto-T System
4-20mA ►Modbus
>Menu >Setup
ATI/D12/Tox Gas
[protocol option]
HW=X.XX SW=X.XX
MM/DD/YY
>Menu>Setup>System>Version
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