SMC Networks 486DX4 - Manual (Page 55)

AR-B1462 User¡ ¦s Guide
6-5
6.2.7 Serial Port 2 Mode Select (SW1-9 & SW1-10)
SW1-9 & SW1-10 are used to select the interface mode of serial port2.
SW1-9 SW1-10 Serial port 2
OFF OFF RS-232C (*)
ON OFF RS-422
OFF ON RS-485 mode1 (Note 1)
ON ON RS-485 mode2 (Note 2)
Table 6-9 Serial Port 2 Mode Select
When RS-422 or RS-485 mode is selected, you also need to change M5 to select between RS-422 or RS-485
mode.
NOTE: 1. The recommended configuration for RS-485 interface is to set the transmitter to be controlled by DTR
and set the receiver to the inverse state of the transmitter. Receiver is disabled.
2. The receiver is always enabled, so you will receive data that you transmitted previously. It is not
recommended to use this setting as RS-485 interface.
6.3 JUMPER SETTING
Before installing the memory into memory sockets MEM1 through MEM4, you have to configure the memory type
which will be used (ROM/RAM) on the AR-B1462. Each socket is equipped with a jumper to select the memory
type.
You can configure the AR-B1462 as a (FLASH) EPROM disk (ROM only), a SRAM disk (SRAM only) or a
combination of (FLASH) EPROM and SRAM disk.
It is not necessary to insert memory chips into all of the sockets. The number of SRAM chips required depends on
your RAM disk capacity. The number of EPROM chips required depends on the total size of files that you plan to
copy onto the ROM disk and whether or not it will be bootable.
Insert the first memory chip into MEM1 if you are going to configure it as a ROM or SRAM disk. If you use a
combination of ROM and RAM, then insert the (FLASH) EPROM chip starting with the MEM1, and insert the
SRAM chips starting from the first socket which is configured as SRAM.
l M1:is used to configure the memory type of MEM1
l M2:is used to configure the memory type of MEM2
l M3:is used to configure the memory type of MEM3
l M4:is used to configure the memory type of MEM4
CAUTION: When the power is turned off, please note the following precautions.
1. If your data has been stored in the SRAM disk, do not change the jumper position or data will be
lost.
2. Make sure jumpers are set properly. If you mistakenly set the jumpers for SRAM and you have
EPROM or FLASH installed, the EPROM or FLASH will drain the battery’ s power.