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7
RS232 Connection
The RS232 connection is used to control the GSZ67 by an external controller or
computer and can work with our without keypads. The GSZ67 connects to the RS232
controller with a 9-pin db9 connector. The programming reference follows.
RS232 Terminal Settings
To control the amplifier from a PC environment, connect a standard RS-232 cable
from to a PC or other device (which can run a terminal emulator) to the serial port
on the amplifier. Windows “Hyper Terminal” will be used for examples.
Setting Value
Baud 9600
Data Bits 8
Stop Bits 1
Parity none
Flow control none
Emulation auto detect
RS232 Command Summary
All commands consist of three alpha characters followed by request, all enclosed in
parentheses. The request can be in some cases a read request (followed by a “?”), or
a write request (followed by 0-3 ASCII digits). A read command will return the
current setting, and write command will change the setting.
A read request format: (nAA?) where:
( starts the command
n denotes amplifier channel
AA denotes the command
? denotes the read request
) ends the command
Example:
Function Command Response
Volume (1vl?) returns the volume on channel 1 (0-80)
A write request format (nAA###) where:
( starts the command
n denotes the amplifier channel
AA denotes the command
### denotes the value to be written if req’d (leading zero’s ARE necessary)
) ends the command
Example
Function Command Response
On/Off (1on) turns on amplifier channel one
Select Input (1sl7) selects input channel 7 to amp channel 1
Set Volume (1vl60) selects volume on amplifier channel one to
be set at a value of 60