EZT-570S User Manual
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9.1.2 EIA-232
Connections
To connect the EZT-570S to a PC’s serial port, a null-modem cable is required. This type of cable is
designed to allow two devices to communicate with each other via their serial ports. This cable differs
from that of a standard cable because the transmit and receive wires are reversed. If one is not
available, a cable can be fashioned rather easily. Use a high quality shielded cable and connect the
leads as shown below:
PC Serial Connection
EZT-570S Serial Connection
Description Pin
Pin Description
Shield Cover
Cover Shield
TXD Transmit Data
3
3
TXD Transmit Data
RXD Receive Data
2
2
RXD Receive Data
Signal Ground
5
5
Signal Ground
Connect the cable between the chamber’s serial port and the desired serial port on the PC. Make
sure that the serial port settings of the EZT-570S and the host computer match, and be sure to save
any changes to the EZT-570S communication settings. Cycle power to the EZT-570S if any serial
communication settings have been changed and the serial connection is ready for operation.
9.1.3 EIA-485
Connections
The EZT-570S communication interface supplies two RJ-11 connectors for convenient daisy-chaining
of multiple chambers to a single PC’s serial port. The connection requires only two wires, pins 3 and
4 of the RJ11 connector. The PC’s serial port must be capable of RS-485 half duplex communication
or an interface converter must be used. CSZ has tested the following converters for compatibility with
the EZT-570S.
B&B
Electronics
RESmith
707
Dayton
Road
4311
Smith
Drive
PO
Box
1040
Hamilton,
OH
45011
Ottawa,
IL
61350 Phone
513-874-4796
Phone
815-433-5100
http://www.RS485.com
http://www.bb-elec.com
Part #
485OI9TB
for EIA-232 to EIA-85
Part #
ASC24T-B9FPS
Part #
485PS2
(external power supply)
(provided with all cables and power supply)
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