Service manual

Rev. B Appendix A-3
TM-U200 Series (Type B) Service Manual
Confidential
RS-485 interface connector pin assignments and functions
NOTES:
❏
Receive buffer full state differs depending on the printer models. Refer to the specifications for the printers.
❏
The data received is ignored when the space in the receive buffer is 0 byte.s
Pin number Signal name I/O Function
1FG—Frame ground
2 SD1 O Transmit data
3 RD2 O Transmit data
4RD1IReceive data
5RD2IReceive data
7 SG — Signal ground
8 RD1 O 1) When DTR/DSR is selected, this signal indicates whether the host
computer is BUSY or READY. DR1 > DR2 indicates the printer is READY
and DR1 < DR2 indicates the printer is BUSY. The BUSY condition can be
changed, depending on the off-line conditions set by the DIP switches.
When the DTR/DSR control is selected, the printer goes into the BUSY
state (DR1 < DR2) under the following conditions:
2) When XON/XOFF control is selected:
This signal indicates whether the printer is correctly connected and
ready to receive data. DR1 > DR2 (READY) indicates the printer is ready
to receive data. The signal is always DR1 > DR2, 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.
10
11
CS1
CS2
I This signal indicates whether the host computer is BUSY or READY.
CS1 > CS2 indicates the printer is READY and CS1 < CS2 indicates the
printer is BUSY.
1) When DTR > DSR is selected:
The signal is checked and data is transmitted only when the host is
ready to receive data (READY), except for transmissions by
GS ENQ
,
DLE
EOT
, or
GS a
.
2) When XON/XOFF control is selected:
Transmits data regardless of the status of this signal.
Conditions
DIP SW Settings
ON OFF
1. During the period from when power is turned
on (including resetting using the interface) to
when the printer is ready to receive data.
BUSY BUSY
2. During the self-test. BUSY BUSY
3. When the cover is open. — BUSY
4. During paper feeding using the paper FEED
button.
—BUSY
5. When the printer stops printing due to a
paper-end.
—BUSY
6. When an error has occurred. — BUSY
7. When the receive buffer becomes full. BUSY BUSY
Off line