IOtech MultiScan 1200, User Manual

Page: 27 / 364

TempScan / MultiScan User's Manual Chapter 2: TempScan/1100 & MultiScan/1200 17
Calibration
Calibration of cold junction sensor: Software control of calibrated thermocouple using the
ScanCal
program. (Calibration performed for each card and chassis in the system).
Voltage Calibration: Software control of gain and offset.
Calibration Constants: Chassis constants stored in NV-RAM. Card constants stored in card’s on-
board EEPROM.
Hardware Configuration
The TempScan/1100 or MultiScan/1200 unit is equipped with a high-speed IEEE 488 interface and an
RS-232/RS-422 interface. Its IEEE 488 interface is useful in laboratory applications and enables real-
time transfers of acquired data to the host computer’s hard drive for inexpensive mass storage. Its RS-
232/RS-422 interface is ideal in applications that require the placement of instrumentation at remote
distances from the controlling computer, such as process and environmental control.
This unit can be set up with an IEEE 488 or a RS-232/RS-422 interface configuration, as determined
by the DIP switch accessible from the rear panel. This DIP switch via its nine microswitches select
which command set is to be used – IEEE 488 or RS-232/RS-422 – and the operating parameters for
each. The table shows the options for its nine microswitches. Additional DIP switch settings are
shown in the following sections.
Rear Panel DIP Switch
Micro- Label Setting Description
switch # IEEE 488 RS-232/RS-422
1 COMM SELECT 0 IEEE 488 (N/A)
1 (N/A) RS-232/RS-422
2,3
HANDSHAKE (H/S) 00 No Handshake No Handshake
01 Software Handshake only
(XON/XOFF) (See Note)
Software Handshake only
(XON/XOFF) (See Note)
10 Hardware Handshake only
(RTS/CTS)
Hardware Handshake only
(RTS/CTS)
11 Both Hardware and Software
Handshake
Both Hardware and Software
Handshake
4,5
IEEE ADDRESS or 00 Decimal value 0 No Parity
PARITY 01 Decimal value 8 Odd Parity
10 Decimal value 16 Even Parity
11 Decimal value 24 (N/A)
6,7,8 IEEE ADDRESS or 000 Decimal value 0 300 baud
BAUD RATE 001 Decimal value 1 600 baud
010 Decimal value 2 1200 baud
011 Decimal value 3 2400 baud
100 Decimal value 4 4800 baud
101 Decimal value 5 9600 baud (See Note)
110 Decimal value 6 (N/A)
111 Decimal value 7 (N/A)
9 CHASSIS 0 Disabled Disabled
CALIBRATION
ENABLE 1 Enabled Enabled
Note: (1) XON/XOFF handshaking is valid for ASCII transmissions only. (2) At 9600 baud,
hardware (RTS/CTS) handshaking and possibly software (XON/XOFF) handshaking may be
required to maintain serial performance. However, for RS-422 operation with a Macintosh,
RTS/CTS handshaking is not recommended.