C.ITOH 8510A User Manual page 33

19) CER (-) (Carrier Error) (Valid for D type Dip switch only)
This signal is output by switching the Dip switch.
When any of the errors (Parity Error, Framing Error or Overrun Error) is detected, this
signal line must be in "MARK" state within I ms from the stop bit end of the received data.
When the host computer continuously receives codes.
In case the CER line is "MARK" state when the printer receives the CAN code or the DC3
code, or when the printer is deselected by the select switch, the CER line must be in
"SPACE" state (no 20 rnA current flows).
Note: In the Bit Image Graphic mode the CAN code and the DC3 code become Bit Image
Graphic data.
When the transmission error occurs in the Bit Image Graphic and the CER line
becomes "MARK (SPACE),' state, the host CPU does not turn the CER line to
"SPACE (MARK)" state until the Bit Image Graphic mode is finished.
9)
RD
(+)
10) RD (-) (Received Data)
This is a serial data transmission line to the printer from the host CPU. When no data is
transmitted, this line must be in "MARK" state.
11) DTR(+)
12) DTR (-) (Data Terminal Ready)
When the printer is ready for receiving data, the DTR line is "SPACE" state and when the
printer is not ready for receiving, the DTR line is "MARK" state.
(4)
X ON/X OFF, ETX/ACK system (In case of 20 rnA current loop - CD)
When the printer is operated with X ON/X OFF or ETX/ACK system, the following signal lines
are necessary.
I) FG (Frame Ground)
Grounding line for circuit protection.
18) SD(+)
19) SD (-) (Send Data)
This is a serial data transmission line to the printer from a host CPU. When no data is trans-
mitted, this line must be in "MARK" state (20 rnA current flows).
9)
RD
(+)
10) RD (-) (Received Data)
This is a serial data transmission line to the printer from a host CPU. When no data is trans-
mitted, this line must be in "MARK" state.
13) DSR(+)
25) DSR (-) (Data Set Ready)
This is an input signal to the printer. When the printer receives data, this line must be in
"MARK" state.
11) DTR(+)
12) DTR (-) (Data Terminal Ready)
This is an output signal from the printer.
When power is supplied to the printer and the printer finishes the restore operation, the
printer becomes "MARK" (READY) state.
Note: DSR(+) and (-) can be ignored by switching the jumper wire.
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