Grass Valley NV5256 v.1.8 - Manual (Page 29)

NV5256 Machine Control Router • User’s Guide 21
3. Detail
I/O Cables
I/O Cables
All ports are serial, either RS-422 or RS-232, operating at up to 115.2kBaud. The backplane inter-
face is RJ-45. Each RJ-45 port on each port backplane has the following pinout:
It use 4 wires whose usage is controlled by the following circuit. The port can be configured as
“controlling” or “controlled” when the port’s I/O card is RS-422/485 and DTE or DCE when the
port’s I/O card is RS-232. That is because the definition of the port can be reversed during configu-
ration or during operation. This is the circuit:
These are the functions of the pins:
(The other pins are grounded except for pin 2 which is not connected.)
Breakout Panel
If you are using the BP-PORT-64 breakout panel, you might need to know the mapping of the sig-
nals from the RJ-45 side to the 9-pin (female) side. The breakout panel is RS-422/485 only. See
Breakout Panel on page 6 for an illustration.
3
1
8
4
5
6
2 n.c.
1 Gnd
7 Gnd
8 Gnd
Tx +
Rx –
Rx +
Tx –
Rx +
Tx –
Tx +
Rx –
Controlling
Port
Controlled
Port
RJ-45
3
6
Tx
Rx
output data
Select Input = A Ena
input data
5
4
Tx
Rx
A Ena +
–
+
–
A
B
A Ena
A
B
When Tx A is enabled (A Ena), Rx B
is selected and the port passes Rx B
data;
Tx B is enabled when Tx A is disabled
(A Ena). Rx A is selected, and the port
passes Rx A data.
Pin
RS-422 RS-232
Controlling Controlled DTE DCE
3 Tx+ Rx+ Tx Rx
4 Rx– Tx– n.c. n.c.
5 Rx+ Tx+ Rx Tx
6 Tx– Rx– n.c. n.c.