18
Modicon Communication Driver Manual
984 and 584 Modbus Ports
The Modicon P230 Programmer is used to set the communications parameters of the 984 and 584
Modbus ports.
For the PLC address, use the number that coincides with the PLC ID# you have established for this
unit in the PLC Name and Port Table.
Depending on the driver selected in the PLC Name and Port Table, select ASCII or RTU mode.
Be sure to match the baud rate, parity, data bits, and stop bits with the entries made in the PLC Name
and Port Table.
984-38X, -48X, -68X, and -78X
The 984-38X, -48X, -68X, and -78X models contain a switch to determine whether port parameters
will be set up using the dipswitches or configured with the P230 programmer. See the Modicon
manual for your specific PLC for information on the dipswitch settings. A switch is used to determine
if the memory or the dipswitch is actually controlling the port parameters. Modicon recommends that
the dipswitch setting remain in RTU mode so that a maintenance person can plug in a local Data
Access Panel by selecting the dipswitches.
884 Modbus Ports
Modbus port 1 parameters may only be configured using the Modicon P230 Programming Panel. Port
2 parameters may be set either by the Programming Panel or by dipswitches.
Port 1 is factory-set to the following parameters:
Data Bits - 7 (fixed)
Mode
-
RTU
Parity
-
Even
Stop Bits - 1
Baud Rate - 9600
Be aware that 884 models with 4-digit serial numbers have no capability for ASCII mode
communications, therefore RTU mode must be used for these models.
Port 2 parameters may be selected using the dipswitches located at the rear of the 884. The top set of
switches is used to set the address of the PLC. This number corresponds to the PLC ID# entered in the
PLC Name and Port Table.
The address is set as a binary number, where switch 8 is of lowest significance, and switch 1 is of the
highest significance.
Table 1 - Port 2 Dipswitch Settings
The bottom set of switches is used to set communication parameters. Be sure the parameters of both
the 884 and the Operator Station match.
Summary of Contents for Cutler-Hammer PanelMate Modicon
Page 3: ......
