Sollae Systems EZL-90, Manual

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1.2. Dsub 9P male (P1)
number name description level Dir. Etc.
1 - - - - -
2 RXD
Receive Data RS232
Input Mandatory
3 TXD
Transmit Data RS232 Output Mandatory
4 DTR Data Terminal Ready - - Optional
5 GND Ground Ground - Mandatory
6 DSR Data Set Ready - - Optional
7 RTS
Request To Send RS232 Output Optional
8 CTS Clear To Send RS232 Input Optional
9 - - - - -
DTR and DSR can be loop backed with a DTR/DSR loopback jumper (JP6).
See the below section for more information.
1.3. DTR/DSR loopback jumper (JP6)
Some devices require DSR signal (DTR in terms of EZL-90). The devices
recognize the counterpart serial device with DSR. To get DSR signal from
the counterpart serial device, the counterpart serial devices have to
signal DTR.
EZL-90 has no DTR signal, but it has DTR/DSR loopback jumper. If user
set the jumper, EZL-90 returns its DSR signal from user device to DTR
so that user device recognizes the EZL-90.
1.4. Alternative Connector (JP8)