Videoswitch VK-1 - Manual (Page 8)

VK-1 Remote Keyboard User Manual 23/09/2004 11:09
Videoswitch Page 7 Vk602b.doc
1.4 Connecting to more than one Digital Recorder
Digital Recorders can be daisy-chained as illustrated in the diagram below. This configuration allows one or
more keyboards to control multiple Digital Recorders. It also ensures that the clocks of the Digital Recorders
are kept exactly in step (within a second). If the time and date needs adjusting, adjust clock of the “Master”.
The “Slave” will be updated automatically (every minute).
DIGITAL RECORDER (CLOCK MASTER)
DIGITAL RECORDER (CLOCK SLAVE)
Connect to
“IN+” and “IN-”
Connect to
“IN+” and “IN-”
of all other slave VDMs
TWISTED-PAIR
CABLE
T25A
TERMINAL PCB
RS485 TERMINATION = ON
CAT5 CABLE
to
KEYBOARD(S)
Connect to
“OP+” and “OP-”
The last slave VDM should have its RS485 termination ON,
other slaves should have RS485 termination OFF
Note:
RS485 termination may be switched ON either using the switch on the T25A PCB or using the miniature
slide switch on the rear of the VDM. Do not turn both termination switches ON.