10.3 Synchronous Operation
The I/O terminals for synchronous operation on the rear panel allow multiple GS820s to
be connected and operated in synchronization.
I/O Terminals for Synchronous Operation
There are two RJ-11 connectors, one for input and another for output.
6
ZERO
IN
5
AUX
IN
4
GND
3
TRIG
IN
2
START
IN
1
OUTPUT
IN
SYNC IN
6
ZERO
OUT
5
AUX
OUT
4
GND
3
TRIG
OUT
2
START
OUT
1
OUTPUT
OUT
SYNC OUT
IN
OUT
SYNC
Synchronous
input
Synchronous
output
Pin Assignments
Pin No. SYNC IN (Synchronous Input)
SYNC OUT (Synchronous Output)
1
OUTPUT IN (output control input)
OUTPUT OUT (output control output)
2
START IN (sweep start input)
START OUT (sweep start output)
3
TRIG IN (trigger input)
TRIG OUT (trigger output)
4 GND
GND
5
AUX IN (auxiliary trigger input)
AUX OUT (auxiliary trigger output)
6
ZERO IN (zero source control input) ZERO OUT (zero source control output)
When two
wires are
connected
When four
wires are
connected
When six
wires are
connected
Connecting the GS820s
A synchronous operation cable (758960, 6-wire) or a commercially sold cable for the
RJ-11 connector is used to connect between two GS820s. Synchronous operation
becomes possible by connecting the synchronous operation output of a higher
level GS820 to the synchronous operation input of a lower level GS820. Note that
commercially sold RJ-11 straight cables come in three types: 2-wire, 4-wire, or 6-wire.
Depending on the cable that is used, functions that can be synchronized vary as follows:
• When using a 2-wire straight cable: Only the trigger is synchronized.
• When using a 4-wire straight cable: Start, trigger, and auxiliary trigger are synchronized.
• When using a 6-wire straight cable: Start, trigger, auxiliary trigger, and output state are
synchronized.
If you use 6-wire straight cables between GS820s and set the highest level GS820 to
master and other lower level GS820s to slaves, all channels of the connected GS820s
are synchronized. For the procedure to set master and slave, see section 10.4, “Setting
the Synchronization Mode between Units (Master and Slave).” You can also set
synchronous or asynchronous between channels of each GS820. For the procedure
to set the inter-channel synchronization, see section 4.3, “Setting the Inter-Channel
Synchronization Mode.”
10-6
IM 765601-01E
