Jumpers - Cardinal 825 Installation And Technical Manual

Jumpers

J1 and J2 – ISO I/O
When installed, these jumpers allow the 825 indicator to supply (source) 12VDC to a solid-
state relay or other load (100 mA maximum).
To completely isolate the outputs when using an external power source, remove (or place on
one pin only) J1 and J2. The external power source must provide 12 to 24 VDC to P16 pin 1
(12V) and a ground return to P16 pin 10 (GND). The load must still be 100 mA maximum.
J3 – 20mA SRC
This bank of 4 individual jumpers control the 20mA TXD and RXD current source and
active/isolate status of P21 (COM2) when the J7 shunt has been installed to select 20mA
current loop serial protocol for P21 (COM2).
TX 20mA Current Source Enable
TX 20mA Current Source
Active/Isolate
J4, J5 and J6 – 2 WIRE RS-485 JUMPERS
These jumpers select RS-485 2-wire or 4-wire operation. When installed, the RS-485
operation is 2-wire (half duplex). To enable 4-wire (full duplex) operation, jumpers J4, J5 and
J6 must be open (on one pin only or removed).
J7 – RS-232/20mA
This shunt (2x5-pin jumper) controls whether P21 (COM2) uses RS-
232 or 20mA current loop serial protocol. When the shunt is installed
on the center row of pins and the RS232 row of pins, the RS-232 serial
protocol is used. To enable the 20mA current loop serial protocol for
P21 (COM2) the shunt must be installed on the center row of pins and
the 20mA row of pins.
J8 – RS-232/RS485
This shunt (2x5-pin jumper) controls whether P20 (COM3) uses
RS-232 or RS-485 serial protocol. When the shunt is installed on the
center row of pins and the RS232 row of pins, the RS-232 serial
protocol is used. To enable the RS-485 serial protocol for P20 (COM3)
the shunt must be installed on the center row of pins and the RS485
row of pins.
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MAIN PC BOARD, CONT.
8545-M838-O1 Rev D  825 Installation & Technical
RX 20mA Current Source Active/Isolate
RX 20mA Current Source Enable