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Operator Manual
Issue 1
TIL – Eng – Spec – 080
Page 42 of 70
SeaHub
6.3.3. Port C & Port D (RS232, RS485 & ArcNet)
6-Way Female DIN connector, capable of supporting the following modes (under software selection)…
•
RS232 3-Wire (RX, TX, GND)
•
RS485
Half
Duplex
•
ArcNet
LAN
All signals are fully isolated and voltage transient with respect to the communications power supply.
External DC Power (separate to that described for the DC output power sockets) is available on “POWER
POSITIVE”. When the AC “Mains” power source is used, this will be +28V (
±
5%) DC, otherwise the DC
source less 1.4V will be present.
Hardware will support data transfer rates of up to 921,600 baud in RS232/RS485 mode.
Connector face view
RS232
RS485
ARCNET
1
RX TX/RX-A
LAN-A
2
TX TX/RX-B
LAN-B
3
PWR
POSITIVE
PWR
POSITIVE
PWR
POSITIVE
4
PWR
GROUND
PWR
GROUND
PWR
GROUND
5
COMMS
GROUND
COMMS
GROUND
COMMS
GROUND
6
EARTH EARTH EARTH
Notes:
1) The output supply on “PWR POSITIVE” and “PWR GROUND” is isolated with respect to the Data
signals on Pins 1 and 2.
2) The voltage on the Data Signals on Pins 1 and 2 are with respect to the “COMMS GROUND” on
Pin 5.
3) The “EARTH” pin is electrically connected to the housing chassis and Earth pin on the Main’s
power socket.
4) The “COMMS GROUND” pin 5 may be disconnected internally (by means of a jumper) if
required.
5) An internal 150
Ω
termination resistor is fitted across pins 1 and 2, when in RS485 mode.
6) RTS and CTS handshaking protocol not available on this port. PC Serial ports should be
configured to use no handshaking.