UBI EasyCoder 501 – Service Manual
159
22.2
Straps
22. PARALLEL INTERFACE BOARD, cont'd.
1
/. A jumper must be fitted on either S-2 or
S-3!
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
S-1:
Jumper fitted =
BUSY
signal ON until end of
ACK
signal.
No jumper fitted =
ACK
after
BUSY
signal (as on previous
versions of this board).
S-2/3
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).
P-2
Female
Centronics
Connector
P2
S1
S3 S2
S-1
S-2, S-3
