PRINTEX P250 Manual page 14

due to paper shortage enabled by ESC c 4).
6) During macro executing standby status.
7) When an error has occurred.
Reverse data mode
The status data transmission from the printer to the host is processed in the nibble or byte mode. NOTE: At
present, reverse data transmission by nibble.
□ Description
This mode allows data transmission from the asynchronous printer under the control by the host.
Data transmissions in the Nibble mode are made via the existing control lines in units of
four bits. In the byte mode, data transmissions are processed by making the eight-bit data lines
bidirectional.
The both modes fall to process concurrently with the compatibility mode, thereby causing half duplex
transmission.
2.1.2.2 Interface Pin Signal Defination
Interface Pin Assignments for Each Mode
Pin Source
1 Host
Host/Ptr
2
3 Host/Ptr
4 Host/Ptr
5 Host/Ptr
6 Host/Ptr
7 Host/Ptr
8 Host/Ptr
9 Host/Ptr
10 Printer
Printer
11
12 Printer
13 Printer
14 Host
15
16
17
Printer
18
19
20
21
22
PRINTEX P250 User Manual
4-bits Mode
Compatibility
Mode
nStrobe HostClk
Data0(LSB) Data0(LSB)
Data1 Data1
Data2 Data2
Data3 Data3
Data4 Data4
Data5 Data5
Data6 Data6
Data7(MSB) Data7(MSB)
nAck PtrClk
Busy PtrBusy/Data3, 7
Perror AckDataReq/Data2, 6
Select Xflag/Data1, 5
nAutoFd HostBusy
NC
GND GND
FG
Logic-H Logic-H
GND GND
GND GND
GND GND
GND GND
ND
FG
8