VISTEK V1679 single-mode fibre
data transceiver
18
Issue 1
4.3
RS-232/422 Examples
Always wanted to extend the cable of your Serial PC Mouse by up to 60kms?
A Serial PC Mouse only requires RxD/TxD and CTS/RTS, hence the second port can be used for something
more useful. Although this is not a particular serious application, it shows how easy it is to demonstrate the
V1679's serial communication ports without the need for a second PC or other bulky RS-232 peripherals.
The best way to wire it up is using Vistek's V1679 Breakout Adapter, which can be pushed onto the 44-pin
high density D-type connector at the rear panel and gives instant access to both serial ports and all GPIO
lines.
Please note that a so-called 'Null-Modem' cable (RxD/TxD, CTS/RTS and DSR/DTR signals crossed over) is
required for the connection between the PC's Serial Port and the V1679 at the 'far' end. If the Serial PC
Mouse is equipped with a 9-pin Dsub connector, it can be directly connected via a gender-changer
(male/male) to either COM1 or COM2 at the V1679 sitting at the 'near' end.
V1679/xx
V1679/xx
COM1
COM2
up to 60km single-mode fibre
GPIO
COM1
COM2
GPIO
RS-232
Laser Tx
Laser Tx
PIN-TIA Rx
PIN-TIA Rx
Note:
The two fibre links shown in the diagram can be replaced by a single fibre
cable when using WDM modules on boths ends for multiplexing/de-
multiplexing two distinct wavelengths (e.g. 1310nm and 1550nm).
Up to 16 GPIO's
Up to 16 GPIO's
60km Cable Extension for Serial PC Mouse
using two V1679 Fibre Data Transceivers
Serial PC Mouse
RS-232
Laptop computer
'Null-Modem' Cable
'Near-End' V1679
'Far-End' V1679
Figure 9 : RS-232 Example 1