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REV.-A
3.2.1 8143 Interface Board
When the RS-232C and 20 mA neutral current loop are in use, the printer will also support the 8143
new serial interface.
1 bit
7 or 8 bit*
Odd, Even or Non-parity*
1 bit or more
Asynchronous
75 to 19,200 BPS
Current loop
MARK
=
logical "1" (-3 to -27 V)
SPACE
=
logical "0" (+3 to + 27 V)
MARK
=
logical" 1" (current ON)
SPACE
=
logical "0" (current OFF)
By REV (DTR) signal or X-ON/X-OFF code
(Signal polarity can be inverted by jumper setting.)
*
Can be selected by DIP switch setting on the 8143 board.
Handshaking
Specifications
Synchronization
Bit rate
Word length
Start bit
Data bit
Parity bit
Stop bit
Signal level (EIA level)
RS-232C
NOTE: The parallel interface cable, if connected, should be disconnected before using the 8143 board
because parallel interface input is used to read jumper settings and DIP switch status.
Jumper Settings
Table 3-2 shows the 8143 interface jumper settings.
Table 3-2. 8143 Jumper Settings
Function
J1
ON: "TTY TXD" is pulled up to
+
12V through 470 ohm resistor.
J2
ON: "TTY TXD RET" is connected to signal ground.
J3
ON: "TTY RXD" is pulled up to
+
12V through 470 ohm resistor.
J4
ON: "TTY RXD RET" is connected to signal ground.
J5
ON: "DTR and DCD" are pulled up to
+
12V through 4.7K ohm resistor.
JRS
ON
OFF
Selects input signal level
RS-232C level
Current loop level
JC
OFF
ON
JNOR
Selects polarity to disable
ON
MARK (RS-232C)
OFF
SPACE (RS-232C)
JREV
data entry
OFF
SPACE (Current loop)
ON
MARK (Current loop)
JF
ON
OFF
Outputs X-ON/X-OFF
Selects TTY TXD function
Outputs DTR flag
signal
JX
OFF
ON
3-2
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