Edwards STP-iXA4507 Series User Manual

STP-iXA4507 series Turbomolecular Pump
MT-91E-001-0
Page 63
SERIAL COMMUNICATION PROTOCOL
5
5.2.2 Connecting the RS485
Make sure the following when using the serial port COM2 with RS485.
• A connection condition is 1 on 1 (single point connection) or 1 on N (multi-point connection).
Up to 32 SIMs can be connected with the multi-point connection.
• After receiving commands, SIM will return a response 5 msec later at the shortest. Connect a PC
that switching time between transmitting and receiving is 5 msec or less.
• Use twisted-pair wires for communication cables. The sum length of the communication cables
should be 1.2 km or less.
• Connect the terminators to the communication devices at both transmission line ends. Use 120 Ω,
0.25 W resistors for the external terminator.
• The internal terminator of the STP side is available. When using it, set it by STP-Link (optional
accessory) or display unit iDT-002 (optional accessory). Do not use an internal and an external
terminator simultaneously. It can cause some communication failures.
PC
7 (D–)
8 (D+)
120Ω
120Ω
(External
*1
)
外付け）
(Internal
*1
)
SIM
(connector X2)
a) RS485 single point connection
PC
7 (D–)
8 (D+)
120Ω
7 (D–)
8 (D+)
120Ω
7 (D–)
8 (D+)
(External
*1
)
(Internal
*1
)
SIM 1
(connector X2)
SIM 2
(connector X2)
SIM N
(connector X2)
b) RS485 multi-point connection
*1 Either internal or external
Figure 33 - RS485 connections

Edwards STP-iXA4507 Series Specifications

General

Brand	Edwards
Model	STP-iXA4507 Series
Category	Water Pump
Language	English