101
UBI EasyCoder 501 – Technical Manual
INTERFACES, cont'd.
Three different straps can be fitted on the Parallel Interface Board:
Ex5V
Jumper fitted on connector P-2 enables ex5V (max. 200
mA) on pin 18.
Warning! Be careful not to enable the ex5V unintention-
ally, which may cause harm to the terminal, computer or other
device connected to this port!
Busy Signal:
S1:
Jumper fitted =
BUSY
signal on until end of
ACK
signal.
No jumper fitted =
ACK
after
BUSY
signal (as on previous
versions of this board).
S2/S3
1
: Jumper fitted on S-2 =
BUSY
signal on falling edge of
/STROBE
signal (i.e. according to specifications)
Jumper fitted on S-3 =
BUSY
signal on rising edge
of
/STROBE
signal (i.e. as on previous versions of this
board).
1
/. A jumper must be fitted on either S-2 or
S-3.
P-2
Female
Centronics
connector
S-2/S-3
S-1
P2
S1
S3 S2
Parallel Interface Board,
cont'd.
Содержание EasyCoder 501
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