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Appendix E – Vertical Interval Sync (VIS)
182 Modula Instruction Manual
Multiple Enclosures
Systems with multiple enclosures will need a VIS board installed in all enclosures that require vertical
interval sync switching. Attach an external sync source to the master enclosure’s External Sync Input
(P2) connector (FIG. 120). Relay the sync signal to all additional enclosures using the Local Sync Output
(P3) and Local Sync Input (P1) connectors in a daisy chain pattern.
To send the sync signal to multiple enclosures:
1.
Attach an external sync source to the External Sync Input (P2) connector on the master enclosure.
2. Attach a cable to the Local Sync Output (P3) connector on the VIS board in the master enclosure
(FIG. 120).
3. Attach the other end of the cable to the Local Sync Input (P1) connector on the VIS board in the
second enclosure.
4.
For additional enclosures, cable the P3 connectors to the P1 connectors.
5. Optional – Verify system recognition of the VIS board by completing the steps below.
6. Required – Enable the VIS board by updating the configuration file using the steps on page 183.
Verifying System Recognition of the VIS Board
To verify system recognition of the VIS board, attach an external serial control device with a terminal
emulation program to the serial port on the enclosure. The steps below are specifically for using
HyperTerminal on a PC; however, similar devices and programs can be used instead.
To verify that the VIS board is enabled:
1.
Attach a PC to the Modula’s serial port with an RS-232 null modem cable.
1.
Open HyperTerminal and set the serial port settings to match the
Modula’s default settings (see table to the right). If the Modula’s
settings have been changed from the default since installation, use
the current settings instead.
2.
Reapply power to all enclosures that were turned off when the board
was installed.
3. Enter
~scr!
in HyperTerminal.
FIG. 120
Multiple enclosures cabled for external sync
5
From external sync source to P2
From P3 to P1
From P3 to P1
Modula
Serial Port Settings
Baud Rate 9600
Data Bits 8
Stop Bit 1
Parity None
Flow Control None