MKS Granville-Phillips 358 series, Instruction Manual

Page: 37 / 122

Initial Setup
Series 358 Micro-Ion Controller Instruction Manual - 358013 - Rev. B
37
Sy
stem C
o
mponents
Ini
tial
Setup
Installation
Before You
Begin
3.12 RS-232 Computer
Interface Setup
If your Controller does not have this capability, skip to RS-485 Computer
Interface Setup on page 42.
This available capability permits data output to, and gauge control by, a
host computer. Output is either by a command-response mechanism or by
a talk-only mode which is invoked via a switch on the RS-232 board. If you
have this module in your unit, configure it to your system requirements by
setting the switches as instructed in
Selecting Byte Format for RS-232
Module on page 39.
A variety of baud rates and byte framing options are available, as well as
switches to force the handshake lines to an “always true” condition.
Controller RS-232 factory defaults are: 9600 BAUD, 8 data bits, no parity,
1 stop bit; DCD, CTS, DSR forced “true”.
The interface protocol is set using 8 switches.
Internal switches are read upon controller power up. Changes in settings
will take effect upon next power-up cycle.
Connector Pinouts for
RS-232 Computer
Interface
This factory or field-installed option has pin functions as shown in
Table 3-5.
A mating DB-25S connector is supplied in the hardware kit. Use shielded
cable to minimize electromagnetic radiation or susceptibility.
Table 3-4 Setpoint Hysteresis
Setpoint Pressure Pressure Change Relay Actuation Pressure
6.3 x 10
–7
Falling 6.2 x 10
–7
6.3 x 10
–7
Rising 6.3 x 10
–7
+ 10% = 7.0 x 10
–7