Hardware manual

TVI I300 Hardware Manual © Essential Viewing Systems Limited 2010
Page 9
4.5 RS422/RS485 & Triggers – J24
The I300 provides a configurable RS422/RS485 port together with three isolated trigger inputs
on header J24. Each of the triggers is activated by applying an external voltage across the
trigger input and the trigger ground. The following table specifies the mating connector and
connector pins.
J24 – 5x2 JST PHD connector
Description Pin
Tx GND 1
Tx +ve 2
Tx -ve 3
Rx GND 4
Rx +ve 5
Rx -ve 6
Trigger 1 7
Trigger GND 8
Trigger 2 9
Trigger 3 10
When using RS422 the impedance of the Rx and Tx pairs can be switched between 120 ohms
and high impedance via the jumpers J5 and J28 respectively. The impedance is 120 ohms with
the jumper inserted.
4.6 Asynchronous RS232 – J25
The I300 provides a fully connected RS232 port for asynchronous serial communications on
header J25. The following table specifies the mating connector and connector pins.
J25 – 5x2 JST PHD connector
Description Pin
DCD 1
RxD 2
TxD 3
DTR 4
GND 5
DSR 6
RTS 7
CTS 8
RI 9
GND 10