LightSpeed Technologies CAT 860 User Manual download pdf (Page 16)

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1. Overview 2. Setup & Use

3. Optional

Accessories

4. Troubleshooting

5. Warranty, Safety

& Speciﬁcations

1. Overview 2. Setup & Use

3. Optional

Accessories

4. Troubleshooting

5. Warranty, 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

13. RS-232 SERIAL INTERFACE

PROGRAMMING

The CAT 860 uses standard RS-232 protocols as a serial link to an external

control module such as an intelligent wall panel, or a personal computer.

When the Control Select switch in the “RS-232” position, the serial link

offers remote access to operational control circuitry within the CAT 860 for

the purpose of controlling the volume of the audio input and output ports.

Additionally, the serial links allows remote queries of internal CAT 860 system

status.

Command and parameter characters travel serially along the RS-232 signal link

between the external controller and the CAT 860. The command and parameter

information is in the form of two hexadecimal values contained in the 8-data bits

of each RS-232 character. The above graphic illustrates a typical RS-232 logic

waveform representing a character (Data format: 1 Start bit, 8 Data bits, No

Parity, 1 Stop bit). The data transmission starts with a Start bit, followed by the

data bits (LSB sent ﬁrst and MSB sent last), and ends with a “Stop” bit.

The voltage of Logic “1” (Mark) is between -3VDC to -15VDC, while the Logic “0”

(Space) is between +3VDC to +15VDC.

RS-232 Data Signals

RS-232 LOGIC WAVEFORM (8N1)

Serial Interface Protocol

CAT 860 RS-232 SETTINGS

Sync. Method: Asynchronous

Stop Bits: Accepts 1 or 2 stop bits

Baud Rate: 9600 baud

Parity: None

Data Size: 8-bits

Connector: 9-Pin, Female D-Sub

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LightSpeed Technologies CAT 860 User Manual Page 16

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