Publication 1746-UM004A-US-P
Module and Development Software Overview 1-9
BASIC Development Software Interface (DH485)
In this configuration, the serial port on the personal computer interfaced with port
DH485 on the module through a 1747-PIC Interface/Converter. Port DH485
must be configured as the program port with DH485 protocol. See chapter 3 for
additional information on port configuration.
Figure 1.6 BASIC Development software Interface (DH485)
The 1747-PIC Interface/Converter converts the RS-232 signals from the personal
computer RS-232 serial port to RS-485 format.
Module Network Configurations
Your module may communicate with a DH485 network or it can communicate
with a remote device through a modem using the DF1 protocol. When DF1
protocol is used on PRT2, port DH485 is disabled. Typical communication
configurations are shown in the following figures:
• DH485 network configurations – Figure 1.7, Figure 1.8, and Figure 1.10
• DF1 protocol configuration – Figure 1.10
IMPORTANT
When using the BASIC Development Software to interface with
port DH485 of the module, PBASE must be configured for
DH485 communication through the configuration and terminal
selection menus. Refer to the BASIC Development Software
Programming Manual (publication number
1746-PM001A-US-P) for additional information.
ATTENTION
Do not place the module on an active DH485 network until the
node address and baud rate of the module are configured. Refer
to the BASIC Language Reference Manual (publication number
1746-RM001A-US-P) for additional information on setting the
module node address and baud rate.
ASCII Terminal or Personal
Computer Running ASCII
Terminal Emulation Software
Interface/Converter
RS-232 to RS-485
Catalog Number 1747-PIC
SLC 500 Controller
with BASIC or
BASIC-T
Spare Allen-Bradley Parts
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