PROTEM
®
D 404
36
6.0 RS232 operation and protocol
6.1 General
The device is designed for communication via the RS232 interface. The connection can be done
by the added cables (the terminal occupation is shown in figure 6.1). With a simple record you
can read the data from the system. The data-transfer rate is shown in chapter1 (technical data).
The data interrogation can happen an any kind of PC or standard terminal. By using a PC, you
must have a software like a terminal program of DOS 5.0 or higher or you can use Microsoft
Windows 3.0 or 3.1. The PROTEM D404 Software is available on a 3,5’’ disk and is guided via
menu.
Figure 6.1 interface cable PROTEM
PC
The record for interrogate the data includes 5 instructions, which must be send to the device
serially. The syntax of the instructions for DOS and Windows are the same, but caused by the
different character sets (ASCII and ANSI) the spelling is different. The command and the device
identification are the same in both matters.
Command
Function
A
Actual temperature sensor 1
B
Actual temperature Sensor 2
C
Actual temperature Sensor 3
D
Actual temperature Sensor 4
E
Maximum temperature Sensor 1
F
Maximum temperature Sensor 2
G
Maximum temperature Sensor 3
H
Maximum temperature Sensor 4
I
Relay status relay 1 to 4
J
Auto run measure program
After sending the commands the return-message is readable on the screen.