Table of Contents
Advertisement
The cover is fastened to the chassis by two screws on the
bottom near the rear of the unit. Disassembly is as shown
in Figure 2.
Figure 2: Cover Removal
Figure 3: Location of DIP Switches (S101 - S105)
5
OPERATION
Once the application has been determined, the operational
setup of the LTC 8780 must be implemented via DIP
switches. The DIP switches are read by the unit on power-
up and should only be changed when the LTC 8780 Series
system's power is OFF. The paragraphs below describe in
detail each DIP switch function, and Tables 1 - 6 summarize
this information.
Switches S101-1 and S101-2, labelled "BAUD" on the
LTC 8780 Series printed circuit board, are used to set the
baud rate of the RS-232 interface. Four selections are
available - 1200, 2400, 9600, and 38400. Configure the baud
rate of the LTC 8780 to conform to the requirements of
the device being interfaced to. Note: If the LTC 8780 is
being used with variable speed receiver/driver control codes
generated by an Allegiant series matrix switcher, a baud
rate of 2400 or higher must be used. If the LTC 8780 is
being used in its Satellite Selector configuration, its baud
rate must be set to the same baud rate as the
Slide Cover Back
Remove Screws From
Bottom Rear Corners.
(2) Places
S933A32AE
S933A33AE
SatelliteSwitching system (either an Allegiant, a LTC 5112,
or a LTC 5124). See Table 1 to determine the proper
setting for the desired baud rate.
Switch S101-3, labelled "CODE DIST", selects the source
of the data transmitted from the biphase code outputs. If
this switch is OFF, the RS-232 to biphase mode is enabled,
and the RS-232 input data is the source of the biphase code
output. If this switch is ON, the biphase code distribution
mode is enabled, and the biphase code input data is the
source of the biphase code output. See Table 1.
Switch S101-4, labelled "ADDR FUNCT", determines the
functionality of DIP switches S103 (ADDRESS LOW) and
S104 (ADDRESS HIGH). The ADDR FUNCT switch is
operational only when switch S102-4 (MATCH) is ON.
With the ADDR FUNCT switch in the OFF position, only
CCL commands containing addresses which match the
settings of S103 and S104 are transmitted. With the ADDR
FUNCT switch in the ON position, only receiver/driver
commands with addresses for cameras within a block of 64
which match the settings of S103 and S104 are transmitted.
See Table 1.
The three switches described in the next few paragraphs
(S102-1 to S102-3) select a filtering action which control
the types of biphase input data (receiver/driver commands,
Console Command Language (CCL) commands, and
switcher/follower data) that are to be decoded. Refer to
Table 1. This selective filtering action applies to converted
data in either the biphase to RS-232 output configuration
(S101-3 to OFF) or the biphase to biphase (distribution
mode) configuration (S101-3 to ON). The selective filtering
action does not apply to data being received at the RS-232
interface. In this case, all data received from the RS-232
interface is transmitted on the biphase code outputs
regardless of how the biphase transmit select switch
(S101-3) is set. With this capability, the LTC 8780 can be
used to decode, and selectively filter, biphase input data to
RS-232 output while simultaneously converting received
RS-232 data to biphase output.
Switch 102-1, labelled "RCVR DRVR", determines whether
or not receiver/driver type commands received at the
biphase input are transmitted. If this switch is OFF,
receiver/driver commands are filtered out of the data
stream and are not transmitted. If the RCVR DRVR switch
is ON, receiver/driver commands are transmitted, subject
to the MATCH (S102-4) and ADDR FUNCT (S101-4)
switch settings. See Table 1.
Switch 102-2, labelled "XPOINT", determines whether or
not crosspoint data received at the biphase input is
transmitted. If this switch is OFF, crosspoint data is filtered
out of the data stream and is not transmitted. If the
XPOINT switch is ON, all crosspoint data is transmitted.
Note that the crosspoint data is not subject to the MATCH
(S102-4) and ADDR FUNCT (S101-4) switch settings. See
Table 1.
Switch 102-3, labelled "CCL", determines whether or not
Console Command Language commands are transmitted. If
this switch is OFF, CCL commands are filtered out of the
data stream and are not transmitted. If the CCL switch is
ON, CCL commands are transmitted, subject to the
MATCH (S102-4) and ADDR FUNCT (S101-4) switch
settings. See Table 1.
Switch 102-4, labelled "MATCH", is used to select the
address/block matching feature of the LTC 8780. This
feature is used in conjunction with the ADDR FUNCT
switch (S101-4) described above to filter out CCL or
receiver/driver data with address that do not match the
settings of switches S103 (ADDRESS LOW) and S104
(ADDRESS HIGH). If the ADDR FUNCT switch is ON, the
filtering action applies only to receiver/driver data. If the
9
Advertisement
Table of Contents
