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No. 99MBC095A
6. INTERFACE UNIT
(2) Connecting the RS-232C interface to a device specified as a modem (DCE)
Example 1
Flow control method (handshake method controlled by CTS, DSR, DTR, and RTS signals)
1
2
5
6
7
8
3
4
9
1
2
5
6
7
8
9
3
4
SG
RI
RxD
DCD
CTS
TxD
DTR
DSR
RTS
SG
RxD
CTS
TxD
DTR
DSR
RTS
Signal name
Pin No.Pin No.
Signal name
LSM: specified as a terminal (DTE)
9-pin D-sub9-pin D-sub
Device specified as a modem (DCE)
Example 2) DPU-414: Printer (controlled by RTS signal)
The DPU-414 series printer (Manufacturer: Seiko Electronics Co., Ltd.) should
be connected as follows:
1
2
5
6
7
8
3
4
9
1
2
5
6
7
8
9
3
4
SG
TxD
RTS
RxD
*1
*1
SG
RxD
CTS
TxD
DTR
DSR
RTS
Signal name
Pin No.Pin No.
Signal name
LSM: Defined as terminal (DTE)
*1: Pin Nos. 4 and 6 of the printer-side connector are internally connected.
*2: Possible to use a straight-type cable (In this case, it is not necesary to install wirings
shown by the dotted lines) .
9-pin D-sub9-pin D-sub
DPU-414 series printer
NOTE 1. The signals names and pin assignment described here may be different from that
of the user’s devices. Refer to the user’s manual of your own device when
making connections.
2. For this connection always use cables that have a shielding net. Both ends of this
shielding net should be connected (grounded) to the RS-232C connector case.
If the system malfunctions due to external interference noises or high frequency
noise emitted by the system causes interference on radios, TVs, or other, use
shielded wires with mesh.
