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 1Pin 5
Pin 6Pin 9
D-9 Female
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