Lectrosonics VI24 - Manual (Page 14)

The following section is a listing of available VI24 commands. The word “Host” in the command descriptions means
the IBM PC or compatible, AMX controller, or Crestron controller to which the VI24 is connected.
General Device Commands
Get Device Name - Causes the VI24 to send its “name” string back. The first data byte is the length of the name
string, and the rest of the data bytes are the device name.
Host sends command - 1
Host receives data bytes: Byte 1 is the length of the name string (4 for the VI24), bytes 2 thru 5 are the
ASCII values for “VI24”.
Get Firmware Version - Causes the VI24 to send to the host the version number of the current firmware (times ten).
For example, Version 1.0 software would be returned as 10 (decimal).
Host sends command - 25
Host receives data byte: firmware version.
Get Output Status - Causes the VI24 to send the on/off status of each of its 24 output pins, packed into three bytes.
Host sends command - 20
Host receives data bytes: The byte representing output pins 1-8 is sent first, then 9-16, then 17-24. Within
each byte, the lowest-numbered pins occupy the least significant bits. For example, in the case where output
pins 1 and 2 are on and all the rest are off, the three bytes sent would be 3, 0, 0.
Link/Unlink LecNet - Causes the VI24 to connect the PC port through to the LecNet and pause operation, or to
disconnect the PC port from the LecNet and resume operation. This allows the device connected to the PC
port to send commands to other devices connected to the LecNet via the VI24.
Host sends command - 40
Host sends byte - 1 for link, 0 for unlink
Host receives confirmation byte: always 0
Check Link/Unlink Status - Causes the VI24 to indicate whether the PC port is currently linked to the LecNet (and
normal VI24 operation paused) or the PC port is not linked to the LecNet (and the VI24 is operating
normally).
Host sends command - 41
Host receives data byte: 1 for linked, 0 for not linked
SPECIFICATIONS
PC Port: RS-232C, 9600 baud, 8 data bits, no parity, 1 stop bit
Logic Outputs: DB-25 connector. Each output sinks to ground when the associated
conditions are met. Max. current per pin 1.5A pulse, 250mA continuous.
Power Requirements: 70 mA at 20VAC, 1.5 Watts max.
Weight: 0.5 lbs.
Dimensions: 3.25” wide, 1.25” high, 4.50” deep
Specifications subject to change without notice.
14