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Operator Manual
Issue 1
TIL – Eng – Spec – 080
Page 41 of 70
SeaHub
6.3.2. Port B (RS232
[3]
, RS485 & RS422)
9-Way D-Type Male connector, capable of supporting the following modes (under software selection)…
•
RS232 3-Wire (RX, TX, GND)
•
RS485
Half
Duplex
•
RS422 Full Duplex
All signals are fully isolated and voltage transient with respect to the communications power supply.
When used in RS232 mode, the pin out of this port is wired in the same way as a PC serial “COM” port
(i.e. using DTE signal directions), and compatible with any standard RS232 peripherals and cabling.
Hardware will support data transfer rates of up to 921,600 baud in RS232/RS485 mode.
1
2
3
4
5
6
7
8
9
Connector face view
RS232
RS485
RS422
1
‡ ‡ ‡
2
RX TX/RX-A TX-A
3
TX TX/RX-B TX-B
4
‡ ‡ ‡
5
COMMS
GROUND
COMMS
GROUND
COMMS
GROUND
6
‡ ‡ ‡
7
N/A N/A RX-B
8
N/A N/A RX-A
9
‡ ‡ ‡
Notes:
1) Handshaking pins (indicated with “‡”) are internally connected together, but not used during
operation.
2) The “COMMS GROUND” is isolated with respect to the other grounds (i.e. Power) described in
other sections. All voltages on this connector are with respect to this ground
3) Pins 7 and 8 will have RS422 signal levels (
≈
5V) present on them when configured in RS232 or
RS485 mode.
4) An
internal
150
Ω
termination resistor is fitted across pins 2 and 3, when in RS485/RS422 mode,
and pins 7 and 8 permanently.
5) RTS and CTS handshaking protocol not available on this port. PC Serial ports should be
configured to use no handshaking.