OPTO 22 G4LC32ISA-LT, User Manual

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3-6 G4LC32ISA-LT User’s Guide
The G4LC32ISA-LT is shipped from the factory with all B and C group jumpers installed. This setting is
for a G4LC32ISA-LT in a 2-wire or 4-wire RS-485/422 communication link located at the beginning of
the physical link. These jumpers bias and terminate the TX/RX± 2-wire, RX± 4-wire, and IRQ
communication lines. Refer to Figure 3-5 for other jumper settings.
Figure 3-5: COMM jumper settings
2-wire Communication
If the G4LC32ISA-LT is the first controller in an RS-485/422 2-wire communication link, install all
jumpers. If it is the last controller in a 2-wire communication link, install jumpers 1, 3, 4, and 5. If it is
not the first or last controller, install jumpers 3, 4, and 5.
If the IRQ lines are not used, install jumpers 6, 7, and 8. If the IRQ lines are used and the controller is
the first controller in the communication link, install jumpers 6, 7, and 8. If the IRQ lines are used and
the controller is the last controller in the communication link, install jumper 7.
4-wire Communication
If the G4LC32ISA-LT is the first controller in an RS-485/422 4-wire communication link, install all
jumpers. If the G4LC32ISA-LT is the last controller in a 4-wire communication link, install jumpers 1
and 4.
If the IRQ lines are not used, install jumpers 6, 7, and 8. If the IRQ lines are used and the controller is
the first controller in the communication link, install jumpers 6, 7, and 8. If the IRQ lines are used and
the controller is the last controller in the communication link, install jumper 7.
COM Port Address and IRQ Jumpers
The COM Port address and IRQ jumpers are used to select the base I/O address and interrupt line of
the G4LC32ISA-LT’s host port in the computer. Refer to Table 3-3 for the recommended address and
IRQ settings. The default is COM4, address 340, IRQ 5.
INSTALLATION AND SETUP