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Edwards STP-iS1607 Series - RS485 Connection and Parameter Settings

Edwards STP-iS1607 Series
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STP-iS1607 Series Turbomolecular Pump
MT-94E-001-C
Page 74
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 display unit iDT-001 or iDT-002 (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 36 - RS485 connections

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