Service manual

Confidential BTP-M280 Service Manual
- 7 -
Signal Min. Max.
tSetup 750 -
tReady 0 -
tStb 750 -
tBusy 0 500
tHold 750 -
Time Request of Parallel Interface
3.3.3 Pin assignment
Pin Signal source Signal definition Pin Signal source Signal definition
1 H nStrobe 19 Signal Ground
2 H Data 0 (Least Significant Bit) 20 Signal Ground
3 H Data 1 21 Signal Ground
4 H Data 2 22 Signal Ground
5 H Data 3 23 Signal Ground
6 H Data 4 24 Signal Ground
7 H Data 5 25 Signal Ground
8 H Data 6 26 Signal Ground
9 H Data 7 (Most Significant Bit) 27 Signal Ground
10 P Ack 28 Signal Ground
11 P Busy 29 Signal Ground
12 P PError 30 Signal Ground
13 P Select 31 H nInit
14 H nAutoLF 32 P nFault
15 Not defined 33 Signal Ground
16 Logic Gnd 34 Not defined
17 Chassis Gnd 35 Not defined
18 P Peripheral Logic High 36 H nSelectIn
Parallel Interface Pin Assignment
Notice：
 H stands for host end, P stands for printer end.
 Parallel interface signal adopting TTL pressure. Please make sure that both ascending and
descending time of the host end are less than 0.5μs when using the printer to print.
 When data transmitting, the host end should not neglect the Busy signal, otherwise the
printing data will be lost.
 The parallel interface signal cable should be as short as possible.