Proline Low-temperature Thermostats
100
Starting up
YACE0072 / 21.08.07
7.15 RS 232 Interface
7.15.1 Connecting cables and interface test RS 232
Computer Thermostat
Signal
9-pin sub-D-socket
25-pin sub-D-socket
9-pin sub-D-socket
Signal
{
|
{
|
{
|
R x D
2
2
3
3
2
2
T x D
T x D
3
3
2
2
3
3
R x D
DTR 4 20 4 DSR
Signal
Ground
5 5 7 7 5 5
Signal
Ground
DSR 6 6 6 DTR
RTS 7 4 7 CTS
CTS 8 5 8 RTS
{
with hardware handshake: For connecting a thermostat to the PC use 1:1 cable and not a null-
modem
cable!
|
without hardware handshake: the computer / PC must be set to the operating mode “without hard
ware
handshake”.
−
Use screened connecting cable.
−
Connect screen to connector case.
−
The connections are isolated from the remainder of the electronics.
−
Any pins not in use must not be connected!
When a PC is connected up the RS232 interface can easily be
tested
using the Microsoft Windows
operating system. On Windows
®
95/ 98/ NT/ XP with the “Hyper Terminal” program.
7.15.2 Protocol RS 232
−
The interface operates with one stop bit, no parity bit and 8 data bits.
−
Transfer rate either 2400, 4800, 9600 (factory setting) or 19200 baud as selected.
−
The RS232 interface can be operated with or without hardware handshake,
(RTS/CTS).
−
The command from the computer must be terminated with CR, CRLF, or LFCR.
−
The response of the thermostat is always terminated with CRLF.
CR = Carriage Return (Hex: 0D)
LF = Line Feed (Hex: 0A)
