SIERRA VIDEO SYSTEMS 321V, 324V, 321S Instruction Manual

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

1

Contents

Specifications .............................................................................. Page 2

General description ..................................................................... Page 3

Installation................................................................................... Page 3

Audio connector pin listings, Table 1.......................................... Page 4

Circuit description, Model 321V................................................. Page 5

Circuit description, Model 324V................................................. Page 6

Circuit description, Model 321S ................................................. Page 7

Circuit description, control panel................................................ Page 8

Serial control protocol................................................................. Page 8

DOS control program................................................................ Page 11

Parts list, 503101....................................................................... Page 12

Parts list, 503130....................................................................... Page 13

Parts list, 503105....................................................................... Page 14

Parts list, 803104....................................................................... Page 15

Schematic diagram, 503101 (4 pages) ..................................... Page 16

Schematic diagram, 503130....................................................... Page 20

Schematic diagram, 503105 ...................................................... Page 21

Schematic diagram, 803104 ...................................................... Page 22

Schematic diagram, 503130 (2 pages) ..................................... Page 23

Component locations, 503105................................................... Page 24

Component locations, 503101................................................... Page 25

Warranty statement............................................................... Rear cover

Warranty registration card....................................................... Attached

2

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

Video input characteristics

Nominal video level........................................... 1V p-p

Maximum video level..................................... 1.5V p-p

Impedance............................................................. 75 Ω

Return loss .......................................... 40 dB @ 5 MHz

Superimposed DC.............................................. +/- 5 V

Connector type...................................................... BNC

Video output characteristics

Nominal video level........................................... 1V p-p

Maximum video level..................................... 1.5V p-p

Impedance............................................................. 75 Ω

Return loss .......................................... 35 dB @ 5 MHz

DC on signal .................................................+/- 50 mV

Connector type...................................................... BNC

Video system performance

Nominal gain ....................................................... Unity

Gain adjustment range...................................... +/- 2dB

Frequency response .......................+/- 0.1dB to 5 MHz

............................................+0 -1 dB 5MHz to 20 MHz

..........................................+0 -3 dB 20MHz to 40 MHz

Diff phase .............. 0.1 deg @ 3.58 MHz or 4.43 MHz

Diff gain....................0.1 % @ 3.58 MHz or 4.43 MHz

Crosstalk .........................60 dB @ 5 MHz (all hostile)

...........................40 dB @ 40 MHz (bracketed hostiles)

S/N .......................................................80 dB to 5 MHz

System delay........................................................ 14 ns

Input timing variation ....................................... +/- 1 ns

Switching point.................. first line after vertical sync

Vertical rate ..............................................25 to 200 Hz

Audio input characteristics

Nominal input level ..........................+8 dBm @ 600 Ω

Maximum input level......................+18 dBm @ 600 Ω

Source impedance............................................... 600 Ω

Input impedance .................................................30 KΩ

Common mode rejection ......................40 dB @ 60 Hz

Connector type....................."D" miniature per Table 1

Audio output characteristics

Nominal output level ........................+8 dBm @ 600 Ω

Maximum output level....................+18 dBm @ 600 Ω

Source impedance............................................... 600 Ω

Load impedance.................................................. 600 Ω

Audio system performance

Frequency response ................20 to 20 KHz +/- 0.1 dB

Bandwidth....................................................... 100 KHz

S/N .........................105 dB ref +18 dBm 20 to 20 KHz

Crosstalk ........................ 80 dB @ 15 KHz (all hostile)

IM and TDH ......... 0.05 % to + 18 dBm 20 to 20 KHz

Optional control panel

Cable type.......................................... DB9M to DB9M

Maximum length...................................... 200 ft / 60 M

Mechanical characteristics

Frame depth ............................................8.5" / 21.6 cm

Operating temperature range ....................0 - 40 deg C

Input voltage.................. 117 VAC +/- 10 % 57-63 Hz

....................................or 230 VAC +/- 10% 47 - 63 Hz

Power req..................................15 VA (321V & 321S)

Power req............................................... 25 VA (324V)

Weight ...................................................10 lbs / 4.5 Kg

Specifications

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

3

Model 321V 32 by 1 video routing switcher
Model 324V 32 by 4 video routing switcher
Model 321S 32 by 1 stereo audio routing switcher

General description

The SVS Model 321V, 321S and 324V are a
family of small routing switchers with 32 inputs.
Optional local and / or remote panels are simple to
operate, button-per-crosspoint designs. The
electronics for each of these routers is contained
in a 1.75" high EIA standard 1 RU rack mount­able frame. All the circuitry is on a single plug-in
circuit board.

The Model 321V includes built in RS232 serial
control. In addition to the optional remote control
panel, the Model 321V can accept an optional
local control panel in place of the blank front cover.

The Model 324V is a four bus version of the
Model 321V. For the Model 324V RS232 serial
control is an option that is built in at the factory.
The Model 324V accepts four separate 32 by 1
remote control panels.

The Model 321S can be used in either an AFV
configuration, when connected to a Model 321V
or Model 324V, or it can be used as a standalone
32 by 1 stereo audio router.

Installation

Carefully unpack the system. If any damage to the
unit is observed, immediately contact both the
shipping company and SVS.

The Model 321V, 321S and 324V produce almost
no heat, so they can be mounted next to other
equipment without the need to allow space for
cooling. Its shallow depth (8.5") allows the space
behind the Model 32 to aid in the cooling of deeper
heat producing equipment above or below it.

Power supply

Power is provided by an external outlet mounted
transformer (117VAC version only). For 220VAC
units the external transformer has a short input
cable to which the proper AC input connector
must be added. The output of the transformer is a
2M (6ft) cable with a 3 pin female DIN connector.
This mates with the corresponding 3 pin male
DIN connector on the rear of the Model 32
labeled “PWR.”

Video connections

The 32 video input BNC connectors each have an
internal 75 ohm 1% termination. Unused inputs
can be left with no connection. The Model 321V
has two identical outputs. An unused output does
not need to be terminated.

Sync connection (Model 324V only)

The Model 324V has two looped BNC connectors
labled SYNC. These may be connected to house
sync, a reference video or looped from one of the
Model 324 four outputs. If left unconnected the
Model 324V will switch at a random point rather
than in the vertical interval.

Audio connections

Audio connections on the rear of the Model 321S
are made via “D” miniature connectors. Four 25
pin connectors are used for inputs on each channel
(eight audio inputs per connector). The Model
321S has two sets of outputs (two outputs for the
right channel and two outputs for the left channel).
The pinout of all the audio connectors is shown
in Table 1.

4

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

INPUTS 1-8
PIN FUNCTION

1 INPUT 1-

14 INPUT 1+

2 GROUND

15 INPUT 2-

3 INPUT 2+

16 GROUND

4 INPUT 3-

17 INPUT 3+

5 GROUND

18 INPUT 4-

6 INPUT 4+

19 GROUND

7 GROUND

20 GROUND

8 INPUT 5-

21 INPUT 5+

9 GROUND

22 INPUT 6-

10 INPUT 6+

23 GROUND

11 INPUT 7-

24 INPUT 7+

12 GROUND

25 INPUT 8-

13 INPUT 8+

INPUTS 9-16
PIN FUNCTION

1 INPUT 9-

14 INPUT 9+

2 GROUND

15 INPUT 10-

3 INPUT 10+

16 GROUND

4 INPUT 11-

17 INPUT 11+

5 GROUND

18 INPUT 12-

6 INPUT 12+

19 GROUND

7 GROUND

20 GROUND

8 INPUT 13-

21 INPUT 13+

9 GROUND

22 INPUT 14-

10 INPUT 14+

23 GROUND

11 INPUT 15-

24 INPUT 15+

12 GROUND

25 INPUT 16-

13 INPUT 16+

INPUTS 17-24
PIN FUNCTION

1 INPUT 17-

14 INPUT 17+

2 GROUND

15 INPUT 18-

3 INPUT 18+

16 GROUND

4 INPUT 19-

17 INPUT 19+

5 GROUND

18 INPUT 20-

6 INPUT 20+

19 GROUND

7 GROUND

20 GROUND

8 INPUT 21-

21 INPUT 21+

9 GROUND

22 INPUT 22-

10 INPUT 22+

23 GROUND

11 INPUT 23-

24 INPUT 23+

12 GROUND

25 INPUT 24-

13 INPUT 24+

INPUTS 25-32
PIN FUNCTION

1 INPUT 25-

14 INPUT 25+

2 GROUND

15 INPUT 26-

3 INPUT 26+

16 GROUND

4 INPUT 27-

17 INPUT 27+

5 GROUND

18 INPUT 28-

6 INPUT 28+

19 GROUND

7 GROUND

20 GROUND

8 INPUT 29-

21 INPUT 29+

9 GROUND

22 INPUT 30-

10 INPUT 30+

23 GROUND

11 INPUT 31-

24 INPUT 31+

12 GROUND

25 INPUT 32-

13 INPUT 32+

Table 1a Model 32S audio input connections (typical of both channels)

Note: 25 pin D miniature to terminal strip adaptors are available from SVS. For more information,
contact your dealer or call Sierra Video Systems.

Table 1b Model 32S audio output connections

PIN FUNCTION

1 RIGHT OUT -

6 LEFT OUT -

2 RIGHT OUT +

7 LEFT OUT +

3 GROUND

8 LEFT OUT +

4 RIGHT OUT +

9 LEFT OUT -

5 RIGHT OUT -

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

5

If the audio source is unbalanced (one wire with a
shield), connect the single wire to the “+” pin and
the shield to the “G” pin. Leave the “-” pin open.

If the audio source is balanced with no shield,
connect the two wires to the “+” and “-” pins and
leave the “G” pin open.

Control panels

If the local control panel for the Model 321V is
ordered at the same time as the router, the panel is
installed at the factory in place of the front cover.
If the local control panel is added later, begin its
installation by first removing the front cover,
which is held at each end by magnets attached to
the rack frame mounting angles at each end of the
frame. The optional local control panel includes
two ribbon cables which mate with two headers
on the front edge of the Model 32V electronics.
The ends of the cables are labeled “LAMPS” and
“SWITCHES”. The LAMP cable mates with the
header on the left.

The optional remote control panel, if ordered, is a
separate 1 3/4" high rack mount unit plus separate
interconnect cable. After mounting the remote
panel at the desired location, connect one end of
the cable to the connector labeled “CONTROL
PANEL” at the rear of the Model 321V, 321S or
324V frame. The Model 321S has two connectors
labeled “CONTROL PANEL OR AFV”. Either
connector can be used. Connect the other end of
the cable to the connector on the rear of the
remote panel.

If a Model 321S is ordered with a Model 321V or
Model 324V, SVS provides a short cable to tie
one of the connectors behind the Model 321S to
the video router.

Serial control

The Model 321V has built-in RS232 serial
control. Connection is made to a male 3 pin mini­“XLR” connector on the rear of the Model 321V
(a mating connector is supplied with the unit). The
pinout of this connector is as follows:

Pin Function
1 Transmit output of 32V to your SIA input
2 Ground
3 Receive input of 32V to your SIA output

The Model 324V has optional built-in RS232
serial control. Connection is made to a female 9
pin D miniature connector on the rear of the
Model 324V. The pinout of this connector is as
follows:

Pin Function
2 Receive input of 32V to your SIA output
1 Ground
8 Transmit output of 32V to your SIA input

Model 321V Circuit Description

The electronics for the Model 321V are all on a
single plug-in module, the 503101. Refer to the
schematic diagram while reading the following
circuit description. The drawing is divided into 2
pages by circuit function. The following text is
organized the same way.

Video circuits (sheet 1 of 2 of the schematic
diagram). The 503101 video bus is made of 32
discrete video crosspoint circuits. The same
component designators and values are used for all
32 crosspoints. Only one crosspoint is described
here. Video input 1 enters the 503101 on edge
connector J1 pin 4. From there it is AC coupled
through C1. C1 protects the circuitry of the
503135 from possible damage if the incoming
video signal were to have an excessive DC
component on it. R1, after C1, provides a +0.7V
reference to the AC coupled signal. The video
crosspoint which follows is a “T” circuit configu­ration. When a crosspoint is off, the two transistors
in the signal path are both off and the diode
between them is on. This provides very high

6

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

attenuation (over 100db) of an off inputs signal
through the crosspoint. When a crosspoint is on,
both transistors in the signal path are on and the
diode between them is on. Thus the desired video
signal is allowed to pass on to the common bus.

The control of the video crosspoints is done by
four 1 of 8 decoders. A 1 of 4 decoder in turn
enables the proper 1 of 8 decoder. The crosspoint
driving decoders are powered by +8 V and -2 V,
which means that the 31 outputs are at -2V while
the desired crosspoint decoder output is at +8V.

When crosspoint 1 is off, the control side of R4 is
at -2V. Because the anode of D1 is connected to
ground and D1 is in series with R4, their junction
will be at about -0.7V and D1 will be on. The
average voltage at the base of Q1 is 0.0V while its
emitter is at -0.7V. This causes the base emitters
junction of Q1 to be reverse biased and therefore
present a high impedance to the incoming signal
while D1 is a low impedance to the signal. This
produces a fairly high attenuation of the video
signal. Q2, as will be explained later, is also off
and further isolates the input signal when the
crosspoint is in the off state.

To turn on crosspoint one, the first output of the
control decoder changes from -2V to +8. This
causes D1 to now be reverse biased and become a
high impedance. With 0.0V at the base of Q1 and
a positive voltage on R4, Q1 becomes an emitter
follower, buffering the input signal and raising its
DC level to +0.7V. Q2 is another emitter fol­lower. R13 is its emitter resistor. Q2 lowers the
incoming signal level DC by the same amount it
was raised by Q1. This means the signal DC level
at the common bus of the output of the 16
crosspoints is approximately 0.0V. For an off
crosspoint where D1 is forward biased to -0.7V,
the emitter base junction of Q2 is also reverse
biased by 0.7V. In this way Q2 is used in an off
crosspoint as the second series off switch,
attenuating the input signal.

The output of the 32 crosspoints are divided into
four groups of eight crosspoints each. A diode in
series with each eight crosspoint sub-group helps
to reduce the overall bus capacitance. The output
of the four diodes is tied to a common constant
current configured FET, Q4.

The output circuit, U2, is a 50MHz wideband
video amplifier with a very low output impedance
(about 0.1 ohms). R35, in conjunction with R5 +
variable R4, sets the gain of the entire 503101 to
2X. R21 and R22 raises the output impedance to
75 ohms required to interface to external 75 ohm
coax cable environment.

The output of U2 is also fed to the sync separator
circuit (refer now to sheet 1 of 4 of the schematic
diagram). Q5 is turned on by R19 except during
the negative extreme of sync on the video signal.
This results in 8 V P-P inverted sync at the collector
of Q5. U9A and U9B are connected with R52 and
C9 as a low pass filter which separates vertical
interval from the composite sync output of Q5.
The resulting vertical pulse output of U9D feeds
the IRQ input of the control processor.

The control function for the 503101 is performed
by a single chip microprocessor with internal
program. The Motorola MC68HC711D3, U10,
operates at 1.228MHz (1/4 the 4.9125MHz crystal
oscillator frequency). Remote panel control of the
503101 is by a five wire binary pattern. These
lines are “watched” by U10. When a change in
these lines occurs, U10 waits for vertical interrupt
and then outputs the same pattern on lines PC0
through PC4.

The 5 bit code produced by the PC0-PC4 output
of the processor is decoded by U12 and U3
(repeats 4 times) to drive the 32 individual
crosspoints. Each group of 8 crosspoints is driven
by a 3 line to 8 line decoder (U3). The A, B, C
inputs of the four U3’s are tied in parallel to U10
outputs PC0-PC2. PC3 and PC4 are decoded by
U12, a 2 line to 4 line decoder, to enable the
desired U3 decoder.

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

7

The 503101 includes the following circuit to
allow for an optional local control panel. The
external 32 switches are connected as an eight by
four matrix to U7 and U6 which provide switch
rollover and convert the switch closure to a five
bit binary code. U4 and U1 do the inverse to drive
the indicator LED’s in the switches which are also
connected as an eight by four matrix.

In addition to remote or local panel control, the
503101 can also be controlled via RS232. The
protocol for this communication appears later in
this manual. The RS232 receive line is converted
to 0 to +5V swings by Q1. The transmit line is
converted from 0 to +5V to +/- 8V by U11.

The 503101 is powered by a 24VAC center
tapped input on J3 pins 27 and 28. This is then
rectified (D8, D9, D10, and 11), filtered (C25 and
C26) and regulated by U14 to +8V, U13 to +5V
and U15 to -8V.

Model 324V Circuit Description

The electronics for the Model 324V are all on a
single plug-in module, the 503130. Refer to the
schematic diagram while reading the following
circuit description.

Each of the 32 video inputs is buffered before
being connected to the crosspoint matrix. The
input buffer consists of Q1 and its associated
components. The buffer performs the following
funtions:

• Provides a high impedance input to the
incoming video signal.

• Provides a low drive impedance to the
crosspoint matrix.

• Raises the signal level one Vbe (0.7V)
to make up for an equal drop in the
crosspoint matrix.

The crosspoint matrix has four identical buses.
Each bus is made up of eight individual 4 by 1 IC
crosspoint switches (U1). To reduce the capacitive
loading effect of eight crosspoint IC’s tied onto a

common bus, the output of each 4 by 1 IC is
connected in series with a diode. The diode has
much lower reverse bias capacitance than the IC
(by about 10 to 1). The +Vbe offset of the input
buffer equals the drop across these diodes, to
return the nominal DC offset to zero.

Each bus is latched and decoded by two IC's. The
latch consists of 5/6th of a 74HC174 hex latch
(U4 typical). U4 outputs are connected back to its
inputs through 22K resistors to form a positive
feedback latch. The clock input to U4 comes from
the Model 324V’s vertical interval clock generator.
The two LSB lines from U4 connect directly to
the A and B inputs of the 8 crosspoint IC’s on
each bus. The three MSB outputs of U4 are
decoded by a 3 to eight decoder, U3 typical. The
desired output of U3 is low and enables the
corresponding 4 by 1 IC crosspoint.

Optional RS232 serial control for the 503130 is
performed by a single chip microprocessor with
internal program. The Motorola MC68HC711D3,
U15, operates at 1.228MHz (1/4 the 4.9125MHz
crystal oscillator frequency). Remote panel con­trol of the 503130 is by a five wire binary pattern.
These lines are “watched” by U15. When a
change in these lines occurs, U15 sends an update
message out the RS232 port (see Serial Protocol
in the next section of this manual).

When the processor receives a valid serial control
message, the processor drives the proper five
output line with the new crosspoint information
for approximatly 20 milliseonds before returning
those five pins to the input mode.

The 503130 is powered by a 24VAC center
tapped input on J3 pins 27 and 28. This is then
rectified (D2, D3, D4, and D5), filtered (C27 and
C28) and regulated by U12 to +8V, U13 to +5V
and U14 to -8V.

8

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

Model 321S Circuit Description

The electronics for the Model 321S are all on a
single plug-in module, the 503105. Refer to the
schematic diagram while reading the following
circuit description.

Each input signal is attenuated 10 dB by the
divider R1/R2 and buffered by an op amp
follower, U1. Each of the 32 stereo crosspoints on
the 503105 is made using a separate CD4066 IC,
U2. The audio switching on the 503105 is done in
the balanced mode at relatively high level (up to
30V P-P). This maximizes all possible audio
performance characteristics.

The 32 switching IC’s are tied together and feed
the output circuit which is based on U2. U2
provides common mode rejection and 10 dB of
gain to offset the input attenuator.

Control for the 503105 is in the form of a five bit
binary pattern at J3 pins 20 through 24. U11 and
U12 latch the incoming control selection. U13 and
U14 convert the 0 to +5V output of the latch to +/

- 8V. U8 and U9 decode the 5 lines to 1 of 32 to
select the desired crosspoint.

24VAC center tapped is produced by an external
power transformer. The low voltage AC enters the
module on J3 pins 27 and 28. It is rectified by D1
through D4. C1 and C2 are the positive and
negative primary filters respectively. U4 produces
+12V for the audio op-amps. U5 produces -12V
for the audio op-amps. U6 produces +8V for the
audio crosspoints. U7 produces -8V for the audio
crosspoints. U8 produces +5V for the latch circuit.

Remote control panel

The 503104 is a 32 switch circuit board which
uses LED lamps and includes switch encoding
and lamp driver circuits. The 503104 is primarily
used with the Model 321V, 324V and 321S, 32
input video and stereo audio switchers.

Refer to the schematic diagram while reading the
following circuit description. The 32 switches are
connected together in an 8 by 4 matrix configura­tion. U1, U2, and U3 convert this to a 5 line
binary pattern. U4 and U5 convert this back to an
8 by 4 to drive the LED lamp array which is also
configured in an 8 by 4 fashion.

The 503104 is powered via the control cable. U6
provides regulated +5V DC.

Serial Control Protocol

The protocol is designed to use the 7-bit ASCII
character set, usually sent over a RS-232C serial
link at 9600 bps. The high-order data bit is
ignored on all received characters, and is 0 on all
transmitted characters.

The protocol is designed for use over a reliable
channel. Noisy channels, such as modem connec­tions over the telephone network, should use an
error-checking and/or error-correcting protocol,
including such things as packet check sums or
CRC’s. Newer modems include such communica­tion schemes as part of their normal operation,
and are recommended for these applications.

The protocol is designed to be compact, with few
characters required to cause switch changes to
occur. It is also designed to be human-readable
and thus easy to understand and use. Finally, it is
a modified subset of the existing SVS host protocol,
allowing a degree of compatibility with those
existing systems.

Several different switch request commands are
defined, so that the one that is most compact for
any given switcher and application can be chosen.

All input, output, and level numbers begin at
number 1, not 0.

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

9

Command string

Commands are sent to a routing switcher in a
group called a command string. A command
string can contain zero or more commands,
limited only by the size of the receive buffer of
the switcher, which should be large enough to
hold a command string for setting the state of the
entire switcher matrix.

A command string consists of a leader, zero or
more commands, and a trailer. If a leader character
is encountered within the command string, the
command string up to that point is discarded and a
new command string is started. Once a complete
command string, up to the trailer character, is
received, the routing switcher executes the
commands within it.

Within the command string, certain ASCII charac­ters may be present and are ignored: any ASCII
character whose code is less than or equal to the
SPACE character, and any whose code is greater
than the “~” (tilde) character. Alphabetic charac­ters within the command string may be in either
upper-case or lower-case letters.

Just before the switcher begins executing a
command string, it sends a leader character to the
host. After the command string has been executed,
the routing switcher returns the string “OK” (with
a single space character before and after the word
“OK”), followed by a trailer character (~) and a
CR character, to the host. This indicates that the
command has executed successfully. If an error
occurs within any command of a command string,
the remainder of the command string is ignored
and the switcher returns the string “ERROR”,
followed by a trailer character and CR character,
to the host. An error consists of an unknown
command name or bad arguments to a command.

Leader and Trailer.
“*” is a command string leader and “!” is a
command string trailer.

The simplest possible command string would be
“*!”, which consists of the leader and trailer
characters but no command between them. This
command string would generate the response
“* OK!” followed by “CR”. This can be useful
for verifying that the serial link to the switcher is
operational.

Following is the command set:

S

yntax Example Description
I I Capabilities inquiry.
S S Status inquiry.
U {0 | 1} U0 Update request on/
off.
X out, in, lvl X12,9,2 Connect crosspoint.
Z in, in... Z13,12,8 Connect AFV.

“I”: Capabilities Inquiry
The command “I” requests that capability infor­mation be returned to the host. The information is
sent as a string of characters. The first characters
are a space followed by “I”, the next characters
are the command letters that are implemented as
commands, and the last character is “~” (tilde).

For example, the command:

*I!

might return the following string:

*IILSX~ OK !<CR>

indicating that the switcher supports the “I”, “L”,
“S”, and “X” commands from the host.

“S”: Status Inquiry
The command “S” requests that status information
be returned to the host. The status information is
sent as a string of L x O substrings, where L =
number of levels and O = number of outputs.
Each level/output combination generates a single
substring of status. Thus, a 2-level 16 output
router would generate 2x16 = 32 substrings of
status command output. The length of each

10

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

substring depends on the size of the particular
switcher involved. Larger switchers use bigger
numbers for inputs, outputs, and levels.

The first substring of status is for level 1 output 2,
etc. (However, each substring contains the level
and output numbers, so the sequence in which the
data is sent is not important.) The first characters
of each substring are a space followed by “X”,
then the output number, a comma character, the
input number connected to the output (or 0 if no
connection exists), another comma, and finally the
level number at which the input-output pair is
connected.

For example, the command:

*S!

might have the following two substrings at the
beginning of its response:

* X1,3, 1 X2, 2, 1!

This indicates that output 1 is connected to input 3
and that output 2 is connected to input 2.

“U”: Update Request
The command “U” turns on or off the automatic
sending of updates. The command letter must be
followed by either a “1” (on) or “0” (off) to
specify the new update state.

Updates are automatic messages sent to the host
whenever a matrix crosspoint is changed by
something other than a host command (e.g. by a
keypad or some other remote controlling device).
An update message is identical to the substring
sent by the “S” command described above, and is
preceded by a leader character and followed by a
trailer character and CR character.

For example, the command:

*U1!

turns on automatic updates. When a crosspoint is
changed, the following message might be received:

*X1, 05 ,1!<CR>

indicating that output 1 is now connected to
input 5 on level 1. Note that all-level (AFV)
switches will generate multiple “X” substring
responses, one for each level. Updates can be
sent any time a response to a command is not
being sent. The switcher never mixes updates
with command responses.

To turn off updates, use the command:

*U0!

“X”: Connect Crosspoint
The command “X” is used to request that a con­nection be made. It must be followed by an output
number, a comma, an input number, a comma,
and a level number.

For example, the command:

*X1, 04, 1!

says that a connection is to be made between
output 1 and input 4 on level 1.

“Z”: Connect Outputs AFV
The command “Z” is used to request that a
connection be made. It must be followed by a
comma-separated list of input numbers, one for
each output, up to the number of outputs in the
switcher. Fewer than the number of outputs may
be specified if desired, and the remaining outputs
will be left unchanged. The connection is made on
all levels (AFV).

For example, the command:

*Z4, 3!

says that input 4 is to be connected to output 1 on
all levels and input 3 to output 2.

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

11

Routing Switcher Reset

When a routing switcher first powers up, either
after power is applied or after a reset of the
processor occurs, it sends the following string
to the host:

* RESET Vx.x !<CR>

This informs the host that the switcher has been
reset, and gives the software version number.
Update mode, if implemented, is now ON> “x.x”
is the software revision number, e.g. “V1.1”.

DOS control program.

At the rear of this manual is a 3" DOS disk. The
disk contains a number of files.

• The text of the complete serial protocol for all
SVS routers.

• The compiled program: RTRCTRL (an EXE
file).

• The precompiled source code for RTRCTRL.

• Comments on the program.
RTRCTRL will control any SVS router which has
serial control capability. It uses the “X” message
to send commands to the router.

To use the program, load the contents of the disk
into a new directory on your hard drive. Select
this directory and type RTRCTRL <ENTER>. A
menu screen that sets up the serial port of the PC
will appear. Use this to configure your serial port.
Then press enter. If there is a communications
error between the PC and the SVS serial control
unit, a trouble screen will appear. If communica­tion is established, the trouble screen will still
appear for about one second before the normal
control screen appears. The bottom of the control
screen has additional menu choices, which include
how to exit the program and return to the DOS
shell.

The RTRCTRL program can be used as a starting
point in creating your own program to control
SVS routing switchers. This is why we have
provided the source code. Owning an SVS router
includes the right to use any portion of this pro­gram for your needs. The program is copyrighted.
Do not use it in applications other than the control
of SVS routing switchers.

MacRoute

Also enclosed in the rear of this manual is a
diskette with Sierra Video Systems new software
for the Macintosh. In addition to the latest version
of MacRoute, the disk includes a Teach Text
document which explains the installation and
operation of MacRoute.

12

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

PARTS LIST FOR 503101 32 BY 1 VIDEO SWITCHER MODULE

R1,4 10KΩ 1/4W 5% RESISTOR
R2,3 330Ω 1/4W 5% RESISTOR
C1 22UF 15V TANTALUM CAPACITOR
Q1 2N3906 PNP TRANSISTOR
Q2 2N3904 NPN TRANSISTOR
D1 IN4148
THE ABOVE REPEATS 32 TIMES

U1 74HC137 DECODER
U2 EL2020 WIDE BAND AMPLIFIER IC
U3 (4) MC14028 DECODER
U4 74HC239 DECODER
U5 74HC541 OCTAL BUFFER
U6,7 MC14532 PRIORITY ENCODER
U9 74HC14 HEX INVERTER IC
U10 MC68HC711D3 PROCESSOR WITH OTP “SMALL”
U11 UA741 OP-AMP
U12 MC14556 DECODER
U13 78M05 +5V 100MA REGULATOR
U14 78M08 +8V 500MA REGULATOR
U15 79MO8 -8V 500MA REGULATOR
D8,9,10,11 1N4002 1 AMP DIODE
D2,3,4,5,12 IN4148
Q3 2N5458 FET
R22,23 75 Ω 1/8W 1% RESISTOR
R53,36 220 Ω 1/4W 5% RESISTOR
R3 470 Ω 1/4W 5% RESISTOR
R5 820 Ω 1/4W 5% RESISTOR
R23,30,31,32,33,34,38 1K Ω 1/4W 5% RESISTOR
R35 1.3K Ω 1/4W 5% RESISTOR
R18,20 4.7K Ω 1/4W 5% RESISTOR
R6,13 10K Ω 1/4W 5% RESISTOR
R16,17,24,25,26,27,28 22K Ω 1/4W 5% RESISTOR
R39,52 100K Ω 1/4W 5% RESISTOR
R19 1M Ω 1/4W 5% RESISTOR
R29 10M Ω 1/4W 5% RESISTOR
C3,4,5,16,17 22UF 15V TANTALUM CAPACITOR
C7,8,10,11,12,13,14,40,42,29,30,31,32,33,34,35,36,37,39,41

0.1 UIF CERAMIC CAPACITOR
C9 470PF MICA CAPACITOR
C12,17 100PF MICA CAPACITOR
C27,28 22PF MICA CAPACITOR
Q5 2N3906 PNP TRANSISTOR
Q3 2N3904 NPN TRANSISTOR
R4 1KΩ POTENTIOMETER 3296W-001-102
C23,24 4700UF 25V ALUMINUM CAPACITOR
(1) LED
(1) 44 PIN IC SOCKET
(1) INSULATING WASHER (FOR U15)
(2) LARGE EJECTOR
(4) 4-40 X 1/4" PHIL PH
(2) 4-40 X 3/8" PHIL PH
(4) #4 LOCKWASHER
(6) 4-40 HEX NUT
(1) PC BOARD 403101-02

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

13

PART # DESCRIPTION LOCATION
RF33100-00 RES 330 OHM 5% 1/4W R1 X 32
RF10300-00 RES 10K OHM 5% 1/4W R2 X 32,R51-R55
RF47200-00 RES4.7K OHM 5% 1/4W R59,R60,R62,R64
RF33200-00 RES 3.3K OHM 5% 1/4W R3 X 32
RF10100-00 RES 100 OHM 5% 1/4W R6 X4,R4 X 32
RF22300-00 RES 22K OHM 5% 1/4W R11-R30
RF10200-00 RES 1K OHM 5% 1/4W R31-R50,R57
RF10500-00 RES 1M OHM 5% 1/4W R56,R63
RF47400-00 RES470K OHM 5% 1/4W R58
RF22100-00 RES 220 OHM 5% 1/4W R5 X4
RF82100-00 RES 820 OHM 5% 1/4W R8 X4
RF10400-00 RES 100K OHM 5% 1/4W R61
RT10240-00 1K TOP ADJ POT R7 X4
SD10001-00 DIODE 1N4002 D2-D5
CC10400-00 CERAMIC CAP .1UF C4-C23,C29-C54,
CT22016-00 TANT CAP 22UF16V C1 X 32, C24-C26,C60-C63,C55
CM18000-00 MICA CAP 18PF C58,C59
CM47000-00 MICA CAP 47PF C3 X 4,C2 X 32
CM47100-00 MICA CAP 470PF C65
CA47225-00 4700UF 25V AL CAP C27, C28
ST10014-00 TRANSISTOR 2N5458 FET Q2 X 4
SI10007-03 IC CLC430AJP U2 X 4
SI10076-00 IC 74HC138E U3,U5,U7,U9
SI10013-00 IC ICL232CPE TRANSCIEVER U16
SI10070-00 IC 74HC14N U17
SI10080-00 IC 74HC174E U4, U6, U8, U10
SI10011-00 IC GX214ACDB U1 X32
ST10031-00 REG 78M08 U12
ST10029-00 REG 78M05 U13
ST10032-00 REG 79M08 U14
SC83044-00 44 PIN PLCC SOCKET XU15
SI10065-00 IC 68HC711D3FN U15
HT51001-00 HEATSINK XU12, XU14
CR40014-00 4.9152 MHZ CRYSTAL X1
HL60004-00 LED LED1
HP24003-00 4-40X3/8 PHIL PAN HD
HW22000-00 #4 L/W
HN24010-00 4-40 HEX NUT
HP24002-00 4-40X1/4 PHIL PAN HD
403130 32X4 VIDEO SWITCHER PCB

PARTS LIST FOR 503130-00 34X4 VIDEO SWITCHER MODULE

14

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

PARTS LIST FOR 503105 32 BY 1 STEREO AUDIO SWITCHER MODULE

R1 10K Ω 1/4W 5% RESISTOR
R2 4.99K Ω 1/4W 5% RESISTOR

THE ABOVE REPEATS 128 TIMES

U1 MC3403 IC
U2 CD4066 IC

THE ABOVE REPEATS 32 TIMES

U11,12 74HC14 HEX INVERTER IC
U3,13,14 MC3403 IC
U8,9 CD4514 DECODER IC
U10 78L05 +5V 100MA REGULATOR
U4 * 78M12 +12V 500MA REGULATOR
U5 * 79M12 -12V 500MA REGULATOR
U6 78M08 +8V 500MA REGULATOR
U7 79M08 -8V 500MA REGULATOR
D1,2,3,4 1N4002 1 AMP DIODE
R37,38 2.2K Ω 1/4W 5% RESISTOR
R28,30,34,32,36 1K Ω 1/4W 5% RESISTOR
R27,29,33,31,35 22K Ω 1/4W 5% RESISTOR

R5,10,15,20,
23,24,25,26 100 Ω 1/4W 5% RESISTOR

R4,7,9,12,14,
17,19,22 10K Ω 1/4W 5% RESISTOR

R3,6,8,11,13,
16,18,21 4.99k Ω 1/4W 5% RESISTOR

C8-12,13,14,15,
16,17,19,20,21,22,
23,24,25,26,27,28 0.1 UF CERAMIC

C3,4,5,6,7 22UF 15V TANTALUM CAPACITOR
C1,2 4700UF 25V ALUMINUM CAPACITOR

U4,5 INSULATING WASHER*
U4,5 6106B HEATSINK *
(2) LARGE EJECTOR
(4) 4-40 X 1/4" PHIL PH
(2) 4-40 X 3/8" PHIL PH
(4) #4 LOCKWASHER
(6) 4-40 HEX NUT
(1) PC BOARD 403105

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • [phone] • Fax [phone]

INSTRUCTION MANUAL

15

PARTS LIST FOR 803104 32 BY 1 REMOTE CONTROL PANEL

R1 THRU 12 10K Ω 1/4W 5% RESISTOR
R13 THRU 17 1K Ω 1/4W 5% RESISTOR
R18 THRU 21 220 Ω 1/4W 5% RESISTOR

C2 22UF 15V TANT CAPACITOR
C1 0.1UF CERAMIC CAPACITOR

U1,2 MC14532 IC
U3 74HC541 IC
U4 74HC239 IC
U5 74HC137 IC
U6 78L05 IC REGULATOR

(2) 20 PIN FEMALE CONNECTOR
(1) 9 PIN D CONNECTOR
(2) JACKSOCKETS
(2) 3/16 X 1/2" 4-40 SPACER
(2) 4-40 X 1/4" MACH SCREW
(1) 403104 PC BOARD

1 FRONT PANEL SVS 104020
1 REAR PANEL SVS 104040
1 REAR PANEL PLATE SVS 104003
2 CONNECTOR SWITCHCRAFTTB3M
1 CONNECTOR SWITCHCRAFTPC712A
1 PC BOARD SVS 404014
32 SWITCHES NKK JB15LP3F
32 LENSES NKK NBS. 1-32
2 HEADERS 24 PIN 1-102618-0
10 NYLON SPACERS OLANDER 3/16RNDX1/4"
10 SCREWS OLANDER 4-40X1/4" PH
10 SET SCREWS OLANDER 4-40 X 1/2"
10 SPACERS OLANDER 3/16RD X 3/4"