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receive data
RXD
3
2
Grounding
GND
7
5
Request to send
RTS
4
7
Besides, RS232 also has the smallest subset, which is the way of connecting the
instrument.
Table- 8-2 The smallest subset of the RS - 232 standard
signal
Symbol
Pin number of 9 core connector
send data
TXD
2
receive data
RXD
3
Grounding
GND
5
8.1.1 RS232C connection
The RS-232 serial interface can be interconnected with the controller's serial interface
through direct DB-9 cable.(For example: personal computer or IPC)
Note: the instrument can not use null modem cable.
You can directly manufacture or purchase 9 core straight through cables to Jinke
instrument format.
The user's self-made 3 wire cable should pay attention to:
Using the DB9 port that comes with the PC, you may want to shortcut the 4-6, 7-8
connection of the DB-9 connector (pin) on the computer side
Fig 8
‐
1
RS 232 interface on the rear panel
Suggestion: to avoid electrical shock, please turn off the instrument power when inserting
connectors.
Default communication settings for the instrument:
Transmission mode: full duplex asynchronous communication with start bits and stop bits.
Data bits: 8 bits
Stop bits: 1 bits.
Check bits: None
8.2 Handshake protocol
Because the instrument uses the smallest subset of RS-232 standard and does not use
the hardware handshake signal, in order to reduce the possibility of data loss or data error