19
W&T
RS232 Serial Buffer
Subject to error and alteration
Diagnostics
Starting up an RS232 port is often problematical, since both the
pin assignments and the transmission parameters need to be
correct in order to ensure error-free data transmission. To check
the configuration the Serial Buffer provides two functions, the
settings dump and the Power/Error LED, which can be very use-
ful during installation.
Configuration dump
Pressing and holding down the „Reset“ key while turning on the
RS232 Serial Buffer and then releasing it causes the buffer to
send its current configuration on the output port.
The output is in HPGL format, so that the text is readable for
printers or plotters. If the handshake configuration is incorrect,
the output will be in individual characters. An extremely slow
printout is therefore an indication that the buffer output port
handshake is not being correctly handled. Outputting the con-
figuration on the peripheral device is a simple way of testing
communication between the buffer output and the terminal de-
vice.
2
3
5
7
20
25-pin female
connector
RS232
Serial
Buffer
PC
3 (2)
2 (3)
20 (4)
7 (5)
5 (8)
6 (6)
25 (9) pin
connector
Printer
Plotter
2
3
5
6
7
20
2
3
5
7
20
Summary of Contents for RS232 88102
Page 8: ...22 W T RS232 Serial Buffer...
