Campbell CR800 Specifications Page 13

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CR800 and CR850 Overview
CS I/O
RS232
COMPUTER
Pin 5
Pin 9
Pin 1
Pin 6
FIGURE OV1-3. Serial Communication Interfaces
OV1.2.2 Computer RS-232
The CR800 RS-232 port is not isolated.
Direct connection of the CR800 to a PC is most conveniently done through the
"Computer RS232" port (Figure OV1-3). Table OV1-2 gives a brief
description of each "Computer RS232" pin.
The Computer RS-232 port is a DCE device when connected to a PC with a
serial cable. It also doubles as a DTE device when connected to a modem
device through a null-modem cable. (DTR function is on pin I, Ring is an
input).
Maximum input = ± 25V
Minimum Output = ± 5V
Typical Output = ± 7V
Serial communications is not reliable over cable greater than 50
feet in length.
NOTE
TABLE OV1-2. Computer RS-232 Pin-Out
ABR = Abbreviation for the function name
PIN = Pin number
O = Signal Out of the CR800 to a RS-232 device
I = Signal Into the CR800 from a RS-232 device
PIN ABR I/O Description
1 DTR O data terminal ready
2 TX O asynchronous transmit
3 RX I asynchronous receive
4 not connected
5 GND ground
6 O connected to pin
7 CTS I clear to send
8 RTS O request to send
9 RING I ring
The CR800 is supplied with a six foot 9-pin to 9-pin serial cable and a 9- to
25-pin adapter to facilitate connection to a PC RS-232 port.
OV-5
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