OPTO 22 G4LC32ISA-LT, User Manual

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G4LC32ISA-LT User’s Guide 3-3
jumper settings based on the baud rates in Table 3-1. The default baud rate is 115.2 KBd. This baud
rate may be changed in software.
Controller Address Jumpers (ADDRESS DF0–DF7)
Use these jumpers to select an 8-bit address (from 1 to 255) for the controller. The factory default is
address 1 (jumper DF0 out, all others in). DF7 represents the most significant bit and DF0 represents
the least significant bit. Address 0 is reserved and should not be used as a controller address. A
jumper that isn’t installed in a jumper position equals a logical 1. A jumper that is installed in a jumper
position represents a logical 0.
Table 3-1 (on the previous page) shows the incremental address value added by taking out each of
the jumpers. For example, if jumpers are out for bits 0, 3, and 6, the address would be 1 + 8 + 64 = 73.
To set the jumpers based on a predetermined address, refer to the chart in Appendix D. Alternatively,
you can convert the address into binary format, then set jumpers based on the binary digits in reverse
order. For example, to set an address of 118 (76 hex), use a scientific calculator to convert the number
to binary: 01110110. The final digit is 0, so bit 0 will be in (jumper installed); the second-to-last digit is
1, so bit 1 will be out (jumper not installed); the third-to-last digit is 1, so bit 2 will be out; and so forth.
The result is that jumpers will not be installed on bits 1, 2, 4, 5, and 6. Checking the results by
referring to Table 3-1, an address of 2 + 4 + 16 + 32 + 64 = 118 is determined. Figure 3-2 displays the
jumper configuration for an address of 118.
Figure 3-2: Jumper settings for address 118
RS-485/422 and RS-232 Jumpers
The COM0 and COM1 ports may be configured for either RS-485/422 or RS-232 communication.
Jumper group JP2 configures COM0, and jumper group JP18 configures COM1. Refer to Figure 3-3
for the communication jumper settings. Figure 3-3 shows COM0 configured for RS-485/422
communication, and COM1 configured for RS-232 communication.
Figure 3-3: RS-485/422 and RS-232 communication selection jumpers
INSTALLATION AND SETUP