TallyGenicom LA48N User Guide
D - 3
Interface Information
Pin
Direction
Signal
Description
33
0 volts. Same as pins 14, 19-30.
34
Not used
35
Not used
36
Not used
IEEE 1284-B Nibble Mode signals
The following table briefly gives connector pin assignments in IEEE 1284 mode.
Pin
Direction
Signal
Description
1
To printer
HostClk
High in reverse data transfer phase
2
To printer
DATA BIT 1
These signals are the 1st to the 8th bits of
3
To printer
DATA BIT 2
parallel data.
4
To printer
DATA BIT 3
5
To printer
DATA BIT 4
These signals are active high for a logical 1.
6
To printer
DATA BIT 5
7
To printer
DATA BIT 6
8
To printer
DATA BIT 7
9
To printer
DATA BIT 8
10
From printer
PtrClk
Set to low to qualify data on reverse channel
11
From printer
PtrBusy
Reverse channel: Data 3 and 7
12
From printer
AckDataReq
Reverse channel: Data 2 and 6
13
From printer
Xflag
Reverse channel: Data 1 and 5
14
To printer
Host Busy
Set to low to indicate that the host can
receive data
Set to high Host Acknowledge Receipt
receive data
Set to high Host Acknowledge Receipt
15
Not used
16
0 volts. Logic ground
17
Chassis ground
18
From printer
Peripheral Logic Set to high to indicate the printer is ON
High
High
and all signals are in valid state.
- Max output current 50 mA
- Max output current 50 mA
19-29
0 volts. Signal ground
30
0 volts. Signal ground