Epson HX-20 User Manual - Page 62

communicate, protocol., Epson HX-20 BASIC Tutorial and Reference Manual.

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Plug the small, rounded end of the RS-232 cable into the DIN socket labelled "RS-232" in the back of your HX-20. Then plug the other end of the cable into the corresponding socket on your RS-232 device. Now the HX-20 and the RS-232 device are connected. In order for them to communicate, however, they must share a common protocol. Two devices may be connected electrically, but never communicate properly, if they don't share a common communications protocol. Try to configure your RS-232 device so that it will be compatible with the initial or default protocol of the HX-20, as defined in Table 6-2. TABLE 6-2 HX-20 Default Protocol for RS-232 Port Data rate: Word length: 4800 Baud 8 bits Parity: none Stop bits: 2 CD (Carrier Detect): ignored RTS (Request to Send): held "high" by HX-20 DSR (Data Set Ready): controlled by external device; "high" means HX-20 may transmit data; "low" causes HX-20 CTS (Clear to Send): to wait ignored If you configure the RS-232 device according to this protocol, you will find it very easy to transmit text and data to the device. However, by using appropriate parameters with the OPEN statement, you can command the HX-20 to use any desired proto- col. (See the Epson HX-20 BASIC Tutorial and Reference Manual.) Connecting your HX-20 to a bar code reader On the right side of your HX-20, you will notice a socket marked "BAR CODE." 58

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Plug the small, rounded end of the RS-232 cable into the DIN
socket labelled “RS-232” in the back of your HX-20. Then plug the
other end of the cable into the corresponding socket on your RS-232
device.
Now the HX-20 and the RS-232 device are connected. In order
for them to
communicate,
however, they must share a common
protocol.
Two devices may be connected electrically, but never
communicate properly, if they don’t share a common communica-
tions protocol. Try to configure your RS-232 device so that it will be
compatible with the initial or default protocol of the HX-20, as
defined in Table 6-2.
TABLE
6-2
HX-20
Default
Protocol
for
RS-232
Port
Data rate:
4800 Baud
Word length:
8 bits
Parity:
none
Stop bits:
2
CD (Carrier Detect):
ignored
RTS (Request to Send):
held “high” by HX-20
DSR (Data Set Ready):
controlled by external
device; “high” means
HX-20 may transmit
data; “low” causes HX-20
to wait
CTS (Clear to Send):
ignored
If you configure the RS-232 device according to this protocol,
you will find it very easy to transmit text and data to the device.
However, by using appropriate parameters with the OPEN
statement, you can command the HX-20 to use any desired proto-
col. (See the
Epson HX-20 BASIC Tutorial and Reference Manual.)
Connecting
your
HX-20
to
a
bar
code
reader
On the right side of your HX-20, you will notice a socket marked
“BAR CODE.”
58