Interface Connector Pin Assignments - Epson TM U200D - B/W Dot-matrix Printer Technical Manual

Interface Connector Pin Assignments

TM-U200D printer status and signals
Pin number Signal name
1 FG
2 TXD
3 RXD
4 RTS
6 DSR
7 SG
20 DTR
20 DTR
25 INIT
1-16 Features and General Specifications
I/O
- Frame ground
O Transmit data
I Receive data
O Same as the DTR signal
I This signal indicates whether the host computer can receive data.
SPACE indicates that the host computer can receive data, and MARK indicates
that the host computer cannot receive data.
When DTR/DSR control is selected, the printer transmits data after confirming this
signal (except when transmitting data by DLE EOT and GS a).
When XON/XOFF control is selected, the printer does not check this signal.
Changing the DIP switch setting enables this signal to be used as a reset signal
for the printer.
The printer is reset when the signal remains MARK for 1 ms or more.
- Signal ground
O 1) When DTR/DSR control is selected, this signal indicates whether the printer is
busy. SPACE indicates that the printer is ready to receive data, and MARK
indicates that the printer is busy. The busy condition can be changed by using
DIP SW 1-8 as follows:
Printer
1. During the period from when the power is turned on
(including resetting using the interface) to when the
printer is ready to receive data.
2. During the self-test
3. During paper feeding using the paper feed button.
4. When the printer stops printing due to a paper-end. -
5. When an error has occurred.
6. When a temporary abnormality occurs in the
power supply voltage
7. When the receive buffer becomes full. (*1)
O 2) When XON/XOFF control is selected:
This signal indicates whether the printer is correctly connected and is ready to
receive data. SPACE indicates that the printer is ready to receive data. The
signal is always SPACE except in the following cases:
During the period after the power is turned on until the printer is ready to
receive data.
During the self test.
I Changing the DIP switch setting enables this signal to be used as a reset signal
for the printer (see the DIP switch settings in the "Buttons and Switches" section
of this chapter). The printer is reset when the signal remains SPACE for 1 ms or
more.
Function
DIP SW 1-8 status
ON
BUSY
BUSY
-
-
-
BUSY
OFF
BUSY
BUSY
BUSY
BUSY
BUSY
BUSY
BUSY
Rev.B