1. OUTLINE
1.5 ELECTRONICS SPECIFICATIONS
•Interface circuit
Input circuit | Output circuit |
SN75189 or equivalent | SN75188 or equivalent |
RD | TD |
CTS | RTS |
DSR | DTR |
Signal level
Input voltage: | "H" .. +3V~ + 15V | Output voltage: | "H" .. +6V ~ +13V |
| "L" ... |
| "L" ... |
(2) Centronics interface |
|
|
|
c Data input method: |
| ||
dControl signals
Compatibility mode: | nStrobe, nAck, Busy, PError, Select, nAutoFd, nInit, nFault, nSelectIn |
ECP mode: | HostClk, PeriphClk, PeriphAck, nAckReverse, XFlag, HostAck, |
| nReverseRequest, nPeriphRequest, IEEE1284Active |
e Data input code: | ASCII, JIS |
f Receiving buffer: | 1MB |
gInput/Output circuit configuration and Input/Output conditions
Type | Signal Name |
| Configuration |
|
Input/ |
| +5V | SN74LS14 or equivalent |
|
Data 1 ∼ 8 |
|
|
| |
Output | 1K |
|
| |
| nStrobe/HostClk | +5V |
| Logical level (input) |
|
|
| ||
Input | nInit/nReverseRequest | 1K | SN74LS14 or equivalent | "1" = 2~5V |
| ||||
nAutoFd/HostAck |
|
| "0" = 0~0.4V | |
|
|
|
| |
| nSelectIn/IEEE1284Active |
| 100P |
|
| Busy/PeriphAck |
| +5V | Logical level (input) |
| nFault/nPeriphRequest | SN7406 or equivalent | ||
| "1" = 2.4~5V | |||
Output | nAck/PeriphClk |
| 1K | |
|
| "0" = 0~0.4V | ||
| Select/XFlag |
| 100P |
|
| PError/nAckReverse |
|
|
|
NOTE: When using a Centronics Interface Cable on the
Please put the ferrite core on the Centronics interface cable, close to the connector (printer side), and secure it with a cable band as shown below.
Ferrite Core
Cable Band
Hook
Centronics Interface Cable
Connector (Printer Side)
NOTE: Be sure to close the ferrite core until it snaps.
1- 9
