Operation
16 025-9567E
REMOTE CONTROL OPERATION
Note: The “remote control” signal of the Computer Port connector must be at the
proper level before remote control is attempted. While in remote control mode the
Instant Call panels are disabled. The encoder keypad and display, however, may
still function in parallel if so desired.
Remote control operation allows remote access to all encoder functions. Compatible ASCII
RS-232 serial devices such as CRTs, printers or computers may be attached to the Model 25
via the DB9S computer port connector. In addition to the normal receive and transmit
signals, the Computer Port also supports a Clear-To-Send (CTS) signal which may be used to
indicate that the attached device is not ready to accept encoder output. CTS would commonly
be used to connect to the “busy” signal of a printer for call logging.
The Computer Port uses a common asynchronous serial communications protocol. The port
transmits and receives at full duplex using 8 bits with 1 stop bit and no parity bit. Normally
the most significant bit of the 8 bits is zero. Several other communications parameters are
programmable. The programmable remote control parameters are shown in Table 3.
Table 3. Configurable Serial Port Parameters
Parameter Description
Baud Rate 4800, 600 or 150 baud
New Line Nulls
1 to 255 ASCII NUL characters may follow every carriage
return character sent by the encoder
Bell Use
The ASCII BEL character may be enabled or disabled to work
in parallel with the encoders beeper
CTS Use The monitoring of the Clear-To-Send (busy) signal is optional
CTS Polarity The polarity of the CTS signal is selectable
Logging Enable
The output of call logging and status information via the
computer port may be turned on or off
The operation of the encoder from a remote control device is nearly identical with the
operation from the encoder keypad/display with a few changes and added commands.
Sending of live formats is not possible from a remote control device. Encoder action is
controlled by a single ASCII character that usually has some equivalence to an encoder
keypad key. When controlling the encoder remotely, the supported ASCII characters are
listed in Table 4.
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