Table of Contents
Advertisement
Figure 8-23. Location of RS-485
chip, U-24, on main board
8-24
IQ plus 800/810 Installation Manual
Adding RS-485 to EDP serial port
When used for RS-485 applications, the EDP port can be configured to
operate as a transceiver on a multi-drop twisted-pair line. Optional
integrated chip U24 must be installed in the proper socket on the main
board to configure the EDP port for RS-485 format (Figure 8-23).
Before installing U24, make certain that U22 is not installed. J7-7
(RS-485-A) and J7-8 (RS-485-B) are used for RS-485 applications. See
the connector pinout table below.
RS-485 wiring
EDP Port
J7-7
J7-8
J7-9
J7-10
J7-11
J7-12
*Integrated Chip U24 must be installed; U22 must not be installed.
J9 (Factory
Use Only)
(J7) Serial Comm.
U22
U24
(J4) Digital I/O Wiring
J5
RS-485 COMMUNICATION FOR AUXILIARY PORT
The auxiliary serial port on the expansion board can be configured to
operate in RS-485 format . Integrated chip U7 must be installed in the
proper socket on the expansion board to configure the AUX port as a
485 transceiver (Figure 8-24). Before installing U7, make certain that
U8 is not installed. Terminal J4 on the expansion board is used for the
AUX serial port connections. J4-1 (RS-485-A) and J4-2 (RS-485-B) are
used for RS-485 applications. See the connector pinout table following.
RS-485 (U24)*
485-A
485-B
(J10)
Load Cell Connector
(Terminal Screws on Back)
J8
SW1
J6
EPROM
1 2 3 4 5 6 7
JP2
(1st Load Cell Term)
(2nd Load Cell Term)
A/D Converter
J2
J1
Advertisement
Table of Contents
