Hardware Reference Manual
Hardware Interface
GFK-3022E
September 2021
Hardware Interface
40
The difference of the various RS
–
4xx modes is the Tx/Rx control. RS-422 has Tx and Rx always
active. RS-485 four-wire enables Tx only when there is something to transmit, Rx is always active.
RS-485 two-wire enables Tx and disables Rx when transmitting, disables Tx and enables Rx when
not transmitting. The various modes can be selected within the device driver of the used
operating system.
5.1.12
SATA 2.5 inch Drive Tray Replacement
ATTENTION
The information described in this section applies to service technicians only.
Two additional 2.5 inch storage devices are available for use with the SATA riser board or the
RAID option. The 2.5 inch hard disk trays (located in the front of the unit) can be used as SSD or
rotating devices.
ATTENTION
Before before physically ejecting the device, make sure you dismount or eject the drive from the OS.
To replace the 2.5 inch SATA drive
Note:
Due to the SAT hot-plug capability, there is no need to power down the unit for replacement. Just make sure
you dismount or eject the drive from the OS before physically removing the device.
1.
Locate the position of the hard disk device you want to remove.
Figure 5-14
2.5 inch SATA Drive Device Tray Location
