Honeywell 900 - Table 9 Protocol Selection Versus Setup Parameters for the Serial Port S1;S2

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Communications Serial Port S1/S2
26 900 Control Station User Guide Revision 9
May 2014
Table 9 Protocol selection versus setup parameters for the Serial Port S1/S2
Setup parameter
Protocol selection
ELN Modbus
Master or
Modbus
Master
Advanced
Modbus
Slave
Multidrop
Modbus Slave
Point to Point
(PTP)
Modbus Slave
Modem
Baud Rate (BPS) X X X X X
Modbus Parity X X X NONE
Modbus Stop Bits X X X 1 BIT
Slave Address X X X
Slave Port Enable X X X
Double Register Format X X X
Note: When “Modbus Slave Modem” protocol is selected, the Modbus Parity and Modbus Stop Bits are fixed at
“None” and “1 Bit” respectively and cannot be changed.