Veeco MPS-3000 CE, Technical Manual

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Chapter 8: Serial Communications
The EIA-232 interface standard
1
(formerly known as RS-232C) establishes
electrical and mechanical interface requirements. It does not define the
exact function of all the signals that are used by the various manufacturers
of data communications equipment and serial I/O devices. Consequently,
when the serial interface is plugged into an EIA-232 connector, there is no
guarantee that the device may communicate unless the user has configured
certain parameters to match the computing device requirements. Refer to
the computing device’s technical manual for information on electrical and
mechanical interfacing, setting the interface format, and data transfer
range.
The following information for the MPS-3000 CE power supply will be
needed for successful connection and communication with the computing
device:
• serial communications rate - 9600 baud
The serial communications rate may be adjusted using switches SW1-5 and
SW1-6 on the controller board. Refer to “Controller Board Switch Defini-
tions” on page 20 .
• other parameters - 1 start bit, 8 data bits, 2 stop bits, no parity.
Refer to Table 8.1: for detailed pin assignment.
A maximum of ±25V DC is allowed for the EIA-232 port. Serial communi-
cations wiring should have a minimum insulation rating of 100V DC per
lead; these leads should be shielded, with a drain wire attached to a metal-
lic connector shell. An insulating sheath covering the leads, shield and
drain wire shall have a minimum insulation rating of 300V DC.
1. EIA-232 is a data communication standard established by the Elec-
tronic Industries Association (EIA). The EU equivalent is CCITT V.24
Table 8.1: EIA-232 Pin Assignment
Pin No. Function
2 Receive
3 Transmit
7 Ground
NOTE