GRASS VALLEY 1200, Installation And Service

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2-14
Section 2 Ñ Installation
Serial Port Jumper Settings
1. Remove the Control Processor module from the frame.
2. Locate the three sets of jumpers near the back left corner of the module.
3. Set the jumpers for the RS-232 or RS-422 communication standard as
required by equipment connected to the serial ports. The jumpers are
labeled to indicate which ports they control (Figure 2-7). Note that TTY
port J28 does not have a jumper because it is RS-232 only.
4. Return the module to the frame.
Figure 2-7. Serial Port Jumpers on the Control Processor Module
GPI J27 and Tally J28
GPI (General Purpose Interface) connector J27 (shown in Figure 2-8)
provides 8 input relay closures to a common and 8 output relays closures
to a common. The outputs allow remote triggering of external devices
(such as triggering a credit roll on a character generator). The inputs allow
remote triggering of a variety of switcher functions including transitions,
E-MEM recalls, Aux Bus Tally Back, and crosspoint map switching.
Using the GPI Inputs and GPI Outputs menus, you can assign which
switcher functions are controlled by the GPI inputs and you can assign
which switcher events will trigger GPI output relay closures. Input relays
require at least a 2-field closure to common, and outputs provide at least a
2-field closure to common.
Tally connector J28 provides 16 tally relay closures to a common input
corresponding to the 16 video/key inputs. These are typically used to light
camera tally lamps when the associated switcher input goes on air.
CAUTION
GPI and Tally relay maximum ratings are 28 volts, 100 mA, resistive load. To
prevent relay damage, do not exceed these ratings.
RS232 RS422
RS232 RS422 RS232 RS422
DPM
EDITOR MODEM
J10
J11
J12
Jumpers shown in factory default positions. Change jumper settings
as required by the equipment connected to each serial port.