Processor Unit rear panel description: HT20470 (DC Version)
The rear panel of the Processor Unit holds the power socket and multiple interface ports.
Image
A Ground
B Graphics adapter (Not used)
C Ethernet connector (LAN2)
D Ethernet connector (LAN3)
E  Ethernet connector (LAN4)
F Serial port (COM5)
G Audio input/output 
H Graphics adapter (Mini DisplayPorts)8
I Serial ports (COM1-4)8
J DC power socket8
K USB-C port (Not used)8
L Ethernet connector (LAN1)8
M USB 3.0 ports8
N Powered audio output8
Ethernet connectors
The purpose of each Ethernet connector is predefined.
LAN1 Spare
Not used.
LAN2 Ship network
Use this socket if you want to connect your SU90 system to the ship’s local area network (LAN).
LAN3 Simrad Connect
Use this socket for Ethernet communication with other Simrad products. The Mk2 Operating Panel must be connected to this Ethernet socket.
LAN4 Sonar room/Transceiver
Use this socket for Ethernet communication with the relevant SU90 system unit in the sonar room. It is very important that a high-quality Ethernet cable is used. You must use Cat 5e STP (Shielded Twisted Pair) quality or better. Using cables with lower bandwidth capacity will reduce performance.
The maximum length of the Ethernet cable is 100 meters.
Serial line connectors
Maximum length for an RS-232 serial cable is typically 60 meters with 2400 bps data rate, however this depends on the cable quality. Always check the cable manufacturers specifications for the actual "shunt capacitance". A common figure is 47.5 pF/m, which gives a maximum cable length of about 50 meters.
Even though a standard exist for RS-232 pin configuration, certain manufacturer may still choose their own connector pins for the various signals used. In order to make the RS-232 connection to your peripheral device work properly, you must always consult the relevant instructions provided by the device manufacturer.
Note
Observe that long runs of unshielded cable will pick up noise easily. This is because the RS-232 signals are not balanced.
COM1/COM2/COM3/COM4
This serial port is set up for RS422 communication. In order to set up the serial ports to match your interface requirements, use the dedicated software utility in the device driver. If you need to change these settings, contact your local dealer or distributor for advice. You can also contact our support department.
COM5
This serial port is set up for RS232 communication. This serial communication format is fixed and cannot be changed. This serial port may not be fitted on all computer models.
Use USB-to-serial converters if additional serial lines are required. Several types are commercially available. Note that most USB-to-serial converters will introduce some latency. They may also introduce jitter in the communication. The amount of jitter depends on the quality of the converter.
USB connectors
The Processor Unit offers several USB interface sockets. The USB sockets can be used to interface peripheral devices such as USB flash drives, portable hard disks, mouse and keyboard. USB is normally not used to interface peripheral devices, but this may be possible if you use USB to Serial converters. Note that most USB-to-serial converters will introduce some latency. They may also introduce jitter in the communication. The amount of jitter depends on the quality of the converter.
Dedicated USB ports are provided for the "Wake-up on USB" functionality. "Wake-up on USB" means that you can turn on the SU90 system by activating any USB device connected to a compatible USB port. The computer BIOS (Basic Input/Output System) must be modified to support this functionality.
The sockets supporting "Wake-up on USB" are identified on the connector label.
On the illustration, the sockets are identified with the following character: M.