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119
Reference Manual
00809-0100-4811, Rev DA
Appendix A: Reference Data
January 2015
Reference Data
Figure A-7. Explosion-Proof/Flameproof (Ex d) Installations
Note
For the Ex d case, the diagram is only valid if the HART load resistance is at the + side, otherwise
the load resistance value is limited to 300 
A.1.4 Modbus
®
(output option code M)
See Ordering Information Table A.6 on page 152.
Output
The RS-485 Modbus version communicates by Modbus RTU, Modbus ASCII, and Levelmaster
protocols.
8 data bits, 1 start bit, 1 stop bit, and software selectable parity.
Baud rate: 1200, 2400, 4800, 9600 (default), and 19200 bits/s.
Address range: 1 to 255 (default device address is 246).
HART communication is used for configuration via the HART terminals or tunneling via the
RS-485.
U
E
(V)
R ()
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