Operation Manual

Pin No.
r-
Signal
Sym. Direction Description
20 DATA TERMI'\JAL DTR From printer Signal to indicate that
(Notel) READY
the printer is not ready
for receiving data in
Ready
/Busv protocol
S,S - - -
Unused
to 10,
12 to 19
21 to 25
\loll's:
I SSD signal output can be ~elected between pins -l, 11, 20 by menu.
2. DSR signal valid/invalid can be set by menu.
Signal Levels
RS-232C interface signal levels are as specified below, and meet
the EIA standard RS-232C.
Circuit
(1) Driver
-15 to -3V: LOW= OFF= LOGIC "1"
+ 15 to +3V: HIGH= ON = LOGIC "0"
SN751 88 or eqUivalent
,--------,
INPUT
___ I----n I
I ~~------
---r-t I
OUTPUT
L----- _J
OUTPUT
-------... r----- + 9 v
Jt-----(r::.
-9V
C- 6lnterfacing