Application Advisory
*DATE*
Page 1 of 8
Assemblies Affected:
ZPR68-10
Type:
RS232 PROTOCOL
Date:
October 14, 1999
PRELIMINARY DOCUMENT
This document reflects the changes made since the ZPR68-10 instructions were written.
The changes in the microprocessor code are related to the following areas:
1 - data transmitted and received via the RS232 serial port
2 - settings after recovery from power shutdown
3 - state of C.O. after serial port commands
1 - RS-232 DATA
The code affecting the data transmitted and received via the RS232 serial port has been
modified in three areas and a new data display mode has been added.
First, the code has been modified so that no characters are returned when sending
commands except a + and no query characters are returned except the "answer value"
and a CR(carriage return). This change allows the RS232 link to operate without dealing
with the delay between individual ASCII characters which previously was required.
Second, a flag has been added which can be set and reset by the IR input and queried
and reset via the RS232 serial port. This flag operates independently of all other
functions and is intended for use as an indicator of some function external to the ZPR68-
10 such as a warning device.
Third, the volume can now be incremented or decremented via the RS232 serial port.
The new data display mode causes the ZPR68-10 to send status data to any device
connected to the serial port whenever an IR command is received. This data can be
displayed on a monitor or other device or can be used to log activity.
The ZPR68-10 has a bidirectional data interface which allows control and reading of all
functions by a personal computer, "dumb" terminal or other device. The ZPR68-10 will
communicate with an RS232-type serial port configured for 9600 baud, 8 data bits, 1
stop bit, no parity, full duplex and no handshaking. Raw ASCII data is interchanged.
Only three lines of the RS232 port are utilized, transmit data, receive data and data
ground.
In order to communicate with the ZPR68-10 using a personal computer, you will need a
communications program such as Procomm for the PC or ZTerm for the Macintosh.
Configure the program for 9600 baud, 8 data bits, 1 stop bit, no parity, full duplex and no
handshaking. Determine which port you are going to use to communicate with the
ZPR68-10 and configure the program for that port (COM1 or COM2 on the PC, MODEM
