Kramer Electronics VP-81SIDN - Manual (Page 19)

VP-81SIDN - Connecting the VP-81SIDN 8x1 Digital Step-In Switcher 15
Figure 6: RS-485 Control of Multiple VP-81SIDN Devices via RS-232 and RS-485
To connect up to four VP-81SIDN devices:
1. Connect the RS-232 port on the first VP-81SIDN device to the PC (see
Section
6.3
).
2. Connect the RS-485 terminal block port on the first device to the RS-485
port on the second device, and so on for all devices. (Connect A to A, B to B,
and G to G.)
3. Connect the HDMI LOCAL INPUT on the first device to the HDMI OUT on
the second device, and so on for all devices.
4. Set the machine number and termination as follows:
 The first device is machine number 1 and the subsequent three
devices are machine numbers 2 to 4 (see Section 8.1 )
 Terminate the first and last devices, that is, terminate machine
numbers 1 and 4 (see Section 8.3 ). Ensure that all other devices are
left unterminated