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Edwards STP-iX457 Series User Manual

Edwards STP-iX457 Series
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STP-iX457/iXU457 Series Turbomolecular Pump
MT-86E-001-F
Page 72
5
SERIAL COMMUNICATION PROTOCOL
5.2.2 Connecting the RS485
Make sure the followings when using the serial port COM1 with RS485.
A connection condition is 1 on 1 (single point connection) or 1 on N (multi-point connection).
A maximum number of 32 SIMs are connectable in the multi-point connection.
After receiving commands, SIM will return a response approximately 5 msec later at the shortest.
Connect the PC of which transmit/receive switch time is 5 msec or less.
Use twisted-pair wire in communication cable. The extended communication cables should be
1.2 km or less.
Connect the terminator to the communication devises at both ends of the transmission line. The
external terminator (120 Ω, 0.25 W) is required for connection.
The internal terminator of the STP side is available. When using it, set it by STP-Link (optional
accessory) or power supply unit iPD-240-24V (optional accessory). Do not use an internal
terminator and an external terminator at the same time. Communication failure may occur.
PC
7(D–)
8(D+)
120Ω
120Ω
External
Internal
SIM
(connector X3)
a) RS485 single point connection
PC
7 (D–)
8 (D+)
120Ω
7 (D–)
8 (D+)
120Ω
7 (D–)
8 (D+)
External
Internal
SIM 1
(connector X3)
SIM 2
(connector X3)
SIM N
(connector X3)
b) RS485 multi-point connection
Figure 48 - RS485 connections

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Edwards STP-iX457 Series Specifications

General IconGeneral
BrandEdwards
ModelSTP-iX457 Series
CategoryWater Pump
LanguageEnglish

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