Expanded Serial Communication - Rice Lake IQ plus 800 Installation & Operation Manual

Figure 8-22. Location of duplex 20
mA CL chip, U22, on main board
EXPANDED SERIAL COMMUNICATION (OPTIONAL)
The expanded serial communications option includes:
• Adding duplex 20 mA current loop to EDP serial port
• Adding RS-485 to EDP serial port
Adding duplex 20 mA current loop to EDP serial port
In standard form, the EDP port has duplex RS-232 serial and simulta-
neous output-only 20 mA current loop (CL) communication. To change
the simplex 20 mA CL to duplex, integrated chip U22 must be installed
in the proper connection on the main board (Figure 8-22). Integrated
Chip U24 must not be installed with this application. When used for
duplex 20 mA CL communication, main board connections on the J7
terminal are: J7-7 (CL+ IN), J7-8 (CL- IN), J7-10 (CL- OUT), AND J7-
12 (CL+ OUT). See the connector pinout table below.
Wiring RS-232 and 20 mA
EDP Port :
J7-7
J7-8
J7-9
J7-10
J7-11
J7-12
*Integrated chip U22 must be installed;
U24 must not be installed.
J9 (Factory
Use Only)
(J7) Serial Comm.
U22
U24
(J4) Digital I/O Wiring
J5
RS-232 EDP Port: 20 mA (U22)*
RS-232 IN
RS-232 OUT
GND
(J10) Load Cell Connector
(Terminal Screws on Back)
J8
SW1
J6
EPROM
CL+ IN
CL - IN
CL- OUT
CL+ OUT
1 2 3 4 5 6 7
JP2
(1st Load Cell Term)
(2nd Load Cell Term)
A/D Converter
Optional features
J2
J1
8-23