Lightspeed CAT 860, Руководство пользователя

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31
1. Overview
2. Setup & Use
3. Optional
Accessories
4. T
roubleshooting
5. W
arranty
, Safety
& Specifications
13. RS-232 SERIAL INTERFACE
PROGRAMMING
CONT’D
An external controller, in the form of an intelligent wall panel or a personal
computer, can use the RS-232 serial link to remotely send commands to initiate
actions or queries for the CAT 860. In response, the CAT 860 uses the RS-232
serial link to send acknowledgements or status data back to external controller.
There are two operational command sets; the Basic Command Set for
audio switching and the Advanced Command Set for audio mixing. It is not
recommended to intermix commands from the two command sets.
The Basic Command Set treats the CAT 860 as a simple audio switcher
where only one of four audio/video sources is enabled at one time. The two
microphone channels are controlled as a pair independently from the audio/
video sources. The low-cost serial controllers with their limited functionality
will typically will be restricted to a subset of the Basic Command Set. These
controllers usually cannot utilize the query commands, or the response packets.
More capable high-end serial controllers can take advantage of the complete
features of the Basic Command Set.
The Advanced Command Set treats the CAT 860 as an audio mixer which is
aligned with the traditional usage for Lightspeed CAT 800 series products. The
Advanced Command Set requires the more capable high-end serial controllers
to utilize the CAT 860 to its greatest potential.
It is expected that each button press from the serial controller would use only a
single action/query command packet. If a single button press must issue a string
of multiple action/query command packets then each packet must be separated
by at least a 10ms delay, or alternately, a new command packet must wait until
the CAT 860 issues a response packet/character before it can be sent.
Connector Signal Wiring
Command Structure
* Only 3-Pin Connection
DTE PIN ASSIGNMENTS (DB-9)
1 DCD Data Carrier Detect
2* RxD Received Data
3* TxD Transmitted Data
4 DTR Data Terminal Ready
5* GND Ground (Signal)
6 DSR Data Set Ready
7 RTS Request to Send
8 CTS Clear to Send
9 RI Ring Indicator