126
RS232 Interface
When selecting RS232, the protocol for interfacing and communicating with a PC can
be found in section
7.1 USB/RS-232 Interface
of this manual.
RS485 Interface
The RS485 interface of the Data Storage Card is designed to function on a two-wire
(half-duplex) RS485 network, i.e. data is received and transmitted differentially on the
same pair of wires. The RS485 cabling should be configured as shown:
The wire used to connect the DATA signals from the Data Storage Card to the RS-485
network should be twisted pair.
Before sending a command to the RS485 enabled Data Storage Card, the unit that
the command is intended for needs to be addressed. To send the address, the
following format is used:
X <RS485 Address><line feed>
Note that there should be a character space between “X” and the RS485 address.
After addressing the unit, the command can be sent. The instrument that was last
addressed will receive all subsequent commands sent on the data bus. If the RS485
address specified is “0”, then all RS485 instruments on the bus will receive the
command. The command set used for RS485 is the same as the command set for
USB/RS-232. See section 7.1 for the USB/RS-232 command set.
When using th
e RS485 bus and sending the “0” address, the instruments will not
respond with the Acknowledge (06H or 6 decimal) or Not Acknowledge (15H or 21
decimal) strings after a command is sent, and will not respond to any Query
Commands.
It is also possible to combine the RS485 address and the desired instrument
command all in the same string using the following format:
X <RS485 Address>;<Command><line feed>
Important note: When communicating with the 620L using the RS485/RS232 port,
results are not saved to the Data Storage Card.
Data Card Serial Port
PC / Bus Controller
6
8
5
DATA +
DATA -
DATA +
DATA -
GND
GND
Содержание 620L
Страница 99: ...93 ...
Страница 105: ...99 The following figure shows how to connect the 620L to an Associated Research HypotULTRA III tester ...
Страница 106: ...100 The following figure shows how to connect the 620L to an Associated Research Omnia 8104 tester ...
Страница 123: ...117 From this screen four parameters may be accessed MAC Address Barcode I P Autostart and previous page ...
Страница 125: ...119 After the barcodes are scanned press TEST to initiate the test sequence Pressing RESET will abort the TEST sequence ...