Kramer Electronics VP-81SIDN - Manual (Page 18)

14 VP-81SIDN - Connecting the VP-81SIDN 8x1 Digital Step-In Switcher
6.3 Connecting to the VP-81SIDN 8x1 Digital Step-In
Switcher via RS-232
You can connect to the VP-81SIDN via an RS-232 connection using, for example,
a PC.
To connect to the VP-81SIDN via RS-232:

Connect the Control RS-232 3-pin, terminal block connector on the rear
panel of the VP-81SIDN unit via a 3-wire cable (pin TX to pin 2, RX to pin 3,
and G to pin 5) to the RS-232 9-pin D-sub port on your PC
6.4 Connecting to the VP-81SIDN via RS-485
You can operate the VP-81SIDN via the RS-485 port from a distance of up to
1200m (3900ft) using any device equipped with an RS-485 port (for example, a
PC). For successful communication, you must set the RS-485 machine number
and bus termination.
To connect a device with a RS-485 port to the VP-81SIDN:
1. Connect the TxD+ pin on the RS-485 port of the PC to the A pin on the
RS-485 port on the rear panel of the VP-81SID.
2. Connect the TxD
– pin on the RS-485 port of the PC to the B pin on the
RS-485 port on the rear panel of the VP-81SIDN.
3. If shielded TP cable is used, connect the shield to the G (ground) pin on the
unit.
6.4.1 Connecting and Controlling Multiple VP-81SIDN Devices
You can connect up to four VP-81SIDN devices with operation via RS-232 (as
shown in the example in Figure 6 ) or Ethernet. Connecting four devices provides
37 inputs.