Method B (Figure 8)—Connect the RS-232 9-pin D-sub port on the unit via a straight (flat) cable to the null-modem adapter, and connect the null-modem adapter to the RS-232 9-pin D-sub port on the PC. The straight cable usually contains all nine wires for a full connection of the D-sub connector. Because the null-modem adapter (which already includes the flow control jumpering described in Method A above) only requires pins 2, 3 and 5 to be connected, you are free to decide whether to connect only these 3 pins or all 9 pins.
Figure 8: Straight Cable RS-232 Connection with a Null Modem Adapter
6.2.1DIP-Switch Settings
Configure the VA-8xlby setting the DIP-switches as defined in Figure 9:
Figure 9: Rear Panel DIP-switches (Factory Default)
1-4 | Set the MACHINE # (see Section 6.2.2) |
5Not used
6RS-485 termination for first and last machine = ON (RS-485 line terminates with 110Ω); for others = OFF (RS-485 line is open)
7/8 | Used for the firmware upgrade procedure (see Section 7) |
6.2.2Setting the MACHINE #
To control a unit via RS-232 or RS-485, each unit has to be identified via its unique MACHINE #. Set the MACHINE # on a VA-8xlunit according to the following table. A valid MACHINE # is from 1 to 15.
12 | VA-8xl - Controlling the VA-8xl |
