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18

W&T

RS232 Serial Buffer

Modes

In standard mode (S1.8 = „off“) the RS232 Serial Buffer func-
tions like a data buffer using a FIFO principle. The data leave
the buffer on the output in exactly the same order as they were
written to the buffer by the computer. Pressing the „copy“ key
in this mode causes the entire buffer contents to be output
again, whereas „reset“ clears the buffer contents.

In block mode (S1.8 = „on“) the computer can write as many
data blocks as desired to the buffer, which the buffer then ad-
ministers as separate print/plot jobs. The buffer recognizes the
end of a data block from a pause in the transmission of at least
15 seconds. Each individual job can be output as often as de-
sired by pressing the „copy“ key. The „next block“ key activates
output of the next stored job. After outputting one data block,
the buffer stops outputting until the „copy“ or the „next block“
key is pressed. The „reset“ function clears the buffer contents
in this mode as well.

Pin assignments and buffer connection

The  input  of  the  buffer  is  implemented  as  a  25-pin  SUB-D
socket using DTE, so that as a rule the printer/plotter cable al-
ready present between the computer and buffer can be used.

The buffer output uses a 2m long serial cable with a 25-pin
SUB-D male using DCE at its end, which in most cases can be
plugged directly in to the peripheral.

In a very few cases it may be necessary to jumper pins 5 and 6
inside the 25-pin SUB-D male connector. An example for con-
necting  the  buffer  to  a  9-  and  25-pin  PC  and  to  a  plotter  is
shown in the illustration below:

Содержание RS232 88102

Страница 1: ...15 W T RS232 Serial Buffer Subject to error and alteration Manual RS232 Serial Buffer Models 88102 88256 88257 88409 88410 Release 1 0 W T...

Страница 2: ...us know of any mistakes or misunderstandings you are aware of so that we can recognize and eliminate them quickly Perform work on and with W T products only as described here and only if you have read...

Страница 3: ...o the computer Configuring the buffer Before starting up for the first time the buffer ports must be configured for the desired transmission parameters Serial parameters On the rear side of the buffer...

Страница 4: ...t as often as de sired by pressing the copy key The next block key activates output of the next stored job After outputting one data block the buffer stops outputting until the copy or the next block...

Страница 5: ...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 ha...

Страница 6: ...er indi cates detected parity and frame errors by flashing the Power LED Characters having frame errors are suppressed by the buffer to prevent transmission of incorrect characters which are generated...

Страница 7: ...XON XOFF protocol Code conversion Single code conversion in both directions using EPROM patch Supply voltage AC adapter included Current draw approx 100mA Buffer input 25 pin SUB D female integrated i...

Страница 8: ...22 W T RS232 Serial Buffer...

Страница 9: ...ble free of charge over the Internet allows the data to be read using any PC The transmis sion parameters on the buffer must be set for 9600 baud 8 data bits and no parity After connecting the buffer...

Страница 10: ...er Tele communi cation System 2 3 6 8 5 4 Data In Data Out Handshake Out Signal GND Handshake In Data Out Data In Handshake Out Signal GND Handshake In Configuring the serial parameters On the rear si...

Страница 11: ...et the memory space in of the total capacity which is being used to store call data The buffer replies with a 2 byte ASCII string plus a carriage return Identification In addition to the above command...

Страница 12: ...sites for mo dem operation of the TC Buffer can be described here If you are unsure or if there are difficulties first consult the manual for your modem Settings for modem operation on the buffer Sinc...

Страница 13: ...both directions using EPROM patch Supply voltage 5V regulated Current requirements approx 100 mA 5V regulated or Pin 25 on the telephone equipment AC adaptor supplied Buffer input 25 pin SUB D female...

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