Edwards SCU-1600

SCU-1600 Control Unit for Turbomolecular Pump
March 10 69 Issue 1-a
5
SERIAL COMMUNICATION PROTOCOL
5.2.3 Communication parameter setting
The factory setting of the communication parameter is shown in Table 19. When changing the
communication parameter, refer to Section 3.11, "Parameter set mode".
To use the operational commands of the SCU-1600 (START, STOP, RESET), set the
MANUAL/REMOTE changeover switch on the SCU-1600 to "ON", and set a port to use the Remote
mode, refer to Figure 10.
When the MANUAL/REMOTE changeover switch is "OFF" or a port which is not set as Remote mode,
commands other than the operation commands can be used.
Communication
parameter
SCU-1600 PC setting example
Remote mode I/O Remote I/O Remote, COM1, COM2, STP-Link
Baud rate 9,600 bps 110 to 19,200 bps
Bit length 8 bit 7, 8 bit
Stop bit 1 bit 1, 2 bit
Parity None None, Even, Odd
Driver type RS232 RS232, RS485 single, RS485 multipoint
RS485ID
*1
1 1 to 127
*1
This value is used with "RS485 Multipoint".
Table 19 - Communication parameters
5.3 Protocol specifications
5.3.1 General description
The STP serial communication protocol enables the SIM to receive the communication command,
(Figure 37, item 1) transmitted from the PC and send a response, (Figure 37, item 2) following the
communication command. Each communication command from the PC transmits a text message
(ASCII text) assigned to each function. Communication commands include control commands (STP
pump operation commands, and so forth) and query commands (read-out of STP pump operation
mode, and so forth).
1. Communication command 2. Response
Figure 37 - PC to SIM communication