VISTEK V1679 single-mode fibre
data transceiver
HU-V1679
23
Notes:
1. Grouping of General Purpose Inputs and Outputs:
V1679/IO:
GPI Inputs 1..8 are assigned to Group A. GPI Outputs 1..8 are assigned to Group B.
V1679/IP:
GPI Inputs 1..8 are assigned to Group A. GPI Inputs 9..16 are assigned to Group B.
V1679/OP:
GPI Outputs 1..8 are assigned to Group A. GPI Outputs 9..16 are assigned to Group B.
2. Using COM1 and COM2 for a fully featured RS-232 port, supporting all Modem lines:
Some RS-232 application may require all RS-232 control lines, such as CTS/RST and DST/DTR in addition
to the data lines RxD and TxD.
COM1 or COM2 (unfortunately not both) can be configured to support additional control lines by 'borrowing'
the lines from the other port. This means that control lines CTS/RTS from COM2 can be used to serve as
DSR/DTR for COM1.
The two remaining signal lines at COM2, namely RxD and TxD, can still be used for a RxD/TxD only
communication over COM2, where either no flow control is required or a software flow control (Xon/Xoff) is
used instead.
5.3
V1679 Breakout Adapter
Vistek offers a special Breakout Adapter for the V1679, which gives instant access to all GPIO signals on so-
called spring terminals and to all serial comms lines on two female 9-pin DSUB connectors (COM1 / COM2).
The drawback when using the Breakout Adapter is that the adjacent slot in the rack will be blocked by the
adapter, hence it becomes unusable. One has to consider making an application specific, customized
breakout-cable when rack-space is precious.
Please note that the Breakout Adapter is neither CE nor FCC approved and that unshielded GPIO lines can
cause interference problems with other equipment.
5.3.1
Serial Communications Ports
Pin
RS-232
RS-422
1
NC
NC
2
RxD
Rx+
3
TxD
Tx-
4
DTR
(COM1 only)
NC
5
GND
NC
6
DSR
(COM1 only)
NC
7
RTS
Tx+
8
CTS
Rx-
9
NC
NC
Screw-locks
Shield
Shield
(NC = Not Connected)
Note: Shield is connected to system GND via a 100Ohm resistor.
1
2
3
4
6
7
8
9
5
Figure 13 : RS-232/422 Connector Pinout for COM1 and COM2