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Pin assignments, Rs-422/485 ports – Grass Valley Karrera Video Production Center Installation v.4.1 User Manual

Page 78

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78

KARRERA — Installation & Service Manual

Section 4 — System Cabling

relay coils to clamp inductive spikes. Shielded cable is recommended for
the connection from the switcher to the user tally system.

Pin Assignments

RS-422/485 Ports

Eight RS-422/485 ports are available on the rear of the Karrera 8-RU and 4
RU Frames, and can be used to control various devices, or for switcher
control by an external controller.

Note

The Frame serial port pinout is automatically configured based on assign-
ment. The Frame is the bus controller when controlling external devices,
PBus, and serial tally. The Frame is a tributary when being controlled by an
editor.

Table 3. Tally and GPI Output Specifications

Maximum current for any one output

1 amp AC/DC

Maximum current for any one common

2 amp AC/DC

Maximum off (open circuit) voltage between output and common

60 Volts peak

Maximum voltage between any point and ground (chassis)

60 Volts peak

Table 4. RS-422/485 Pinouts

Socket

Pin

Bus Controller

Tributary

1

Chassis Ground

Chassis Ground

2

RxA (-)

TxA (-)

3

TxB (+)

RxB (+)

4

Signal Ground

Signal Ground

5

Not used

Not used

6

Signal Ground

Signal Ground

7

RxB (+)

TxB (+)

8

TxA (-)

RxA (-)

9

Chassis Ground

Chassis Ground

Pin 1

Pin 5

Pin 6

Pin 9

D-9 Female