Measurement Computing TempScan/1100 - Manual (Page 26)

1-12 System Overview 899493 TempScan / MultiScan User's Manual
A CA-47 cable connects the unit with the computer. The TempScan/1100 or MultiScan/1200 end has one
DB9 connector, and the computer end has two connectors – one for a DB9 and one for a DB25. O
ther crossover-type cables can be used if they are wired as shown in the tables. The tables list the
following four connections from the TempScan/1100 or MultiScan/1200 unit:
• To a DB9 connector configured for RS-232
• To a DB25 connector configured for RS-232
• To a DB9 connector configured for RS-422
• To a Mini DIN8 connector configured for RS-422.
TempScan/1100 or MultiScan/1200
To PC Connection (RS-232)
TempScan/1100 or MultiScan/1200
To PC Connection (RS-232)
DB9 Male
Pin & Signal
Cable
Wirin
g
DB9 Female
Pin & Signal
DB9 Male
Pin & Signal
Cable
Wirin
g
DB25 Female
Pin & Signal
2 RxD- ←-- 3 TxD- 2 RxD- ←-- 2 TxD-
3 TxD- -- → 2 RxD- 3 TxD- -- → 3 RxD-
5 GND ←→ 5 GND 5 GND ←→ 7 GND
7 RTS+ -- → 8 CTS+ 7 RTS+ -- → 5 CTS+
8 CTS+ ←-- 7 RTS+ 8 CTS+ ←-- 4 RTS+
TempScan/1100 or MultiScan/1200
To Macintosh Connection (RS-422)
TempScan/1100 or MultiScan/1200
To Macintosh Connection (RS-422)
DB9 Male
Pin & Signal
Cable
Wirin
g
DB9 Male
Pin & Signal
DB9 Male
Pin & Signal
Cable
Wirin
g
Mini DIN8 Male
Pin & Signal
1 GND ←→ 3 GND 1 GND ←→ 4 GND
2 RTS+ -- → 7 CTS+ 2 RTS+ -- → 2 CTS+
4 TxD+ -- → 8 RxD+ 4 TxD+ -- → 8 RxD+
5 TxD- -- → 9 RxD- 5 TxD- -- → 5 RxD-
6 CTS+ ←-- 6 RTS+ 6 CTS+ ←-- 1 RTS+
8 RxD+ ←-- 4 TxD+ 8 RxD+ ←-- 6 TxD+
9 RxD- ←-- 5 TxD- 9 RxD- ←-- 3 TxD-
The following text describes the various pin connector signals:
• Transmit Data Negative (TxD-): This output pin transmits serial data to an RS-232 or RS-422 device.
The serial data received is sent with the word length, baud rate, stop bits, and parity configured for the
particular port. This signal is low true.
• Transmit Data Positive (TxD+): This output pin transmits serial data to an RS-422 device only.
The pin functions identically to TxD- except that its polarity is inverted. This signal is high true.
• Receive Data Negative (RxD-): This input pin accepts serial data sent by an RS-232 or RS-422 device.
The serial data received is expected to match the word length, baud rate, stop bits, and parity
configuration of the particular port. This signal is low true.
• Receive Data Positive (RxD+): This input pin accepts serial data sent by an RS-422 device only.
It functions identically to RxD- except that its polarity is inverted. This signal is high true.
• Request To Send Positive (RTS+): This output pin is used as a hardware handshake line to prevent an
RS-232 or RS-422 device from transmitting serial data to the TempScan/1100 or MultiScan/1200 unit
when it is not able to accept it. When automatic RTS/CTS handshaking is selected, the unit will assert
(high) the RTS+ signal when greater than 4096 memory locations are available in its internal buffers. If
available memory drops below 4096 bytes, the unit unasserts (low) the RTS+ signal.
• Request To Send Negative (RTS-): This output pin is used as a hardware handshake line with an
RS-422 device only. The pin functions identically to RTS+ except that its polarity is inverted. This
signal is low true.