APPENDIX 2 Parallel Interface
Both the
(1) Specifications
(a) Data transfer rate: | 1000 CPS (min.) | ||||
(b) Synchronization: | By externally supplied | STROBE | pulses. | ||
|
| ||||
(c) Handshaking: | By | ACKNLG | or BUSY signal. | ||
(d) Logic level: | Input data and all interface control signals are compa- | ||||
| tible with the TTL level. |
(2)Connector
Plug:
It is recommended that interface cables be kept as short as possible.
(3)Connector pin assignment and descriptions of signals.
Connector pin assignment and descriptions of respective interface signals are provided in Table
|
|
|
|
|
| These signals represent information of the |
|
|
|
|
|
| 1st to 8th bits of parallel data respectively. |
|
|
|
|
|
| Each signal is at “HIGH” level when data |
|
|
|
|
|
| is logical “1” and “LOW’ when logical |
|
|
|
|
|
|
|
|
|
|
| out | Approx. 5~s pulse. “LOW” indicates that | |
| 28 | ACKN LG |
| data has been received and that the printer | ||
|
|
|
| is ready to accept other data. | ||
|
|
|
| A “HIGH” signal indicates that the printer | ||
|
|
|
| out | cannot receive data. The signal becomes | |
11 |
| BUSY | “HIGH” in the following cases: | |||
29 | 1. During data entry | |||||
|
|
|
| 2. During printing operation | ||
|
|
|
| 3. In | ||
|
|
|
| 4. During printer error status. | ||
12 | 30 | PE |
| A “HIGH” signal indicates that the printer | ||
is out of paper. |
- 8 7 -