BNC 630 - Manual (Page 49)

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6.0 Remote Operation
6.1 Introduction
The Remote Operation feature allows the user to control all operations of the 630 with a terminal or computer. Commands and
responses use ASCII characters; permitting a "dumb" terminal to be used to control the 630.
Each key on the front panel keypad has an ASCII letter associated with it. Sending this letter to the 630 through the serial port has
the same effect as pressing that key on the keypad. In addition, there are extra commands that are only available from the terminal
port. These commands let you perform such tasks as disabling the keypad, printing a help screen, resetting the 630, etc. Section 6.5
describes each command.
When a key is pressed on the front panel of the 630, its associated ASCII character is echoed out to the serial port. This enables a
control program to monitor and act upon front panel keypresses.
6.2 Remote Control Hookup
To use the remote control feature, you must attach the serial port on your computer or terminal to the RS232 connector on the rear
of the 630. On an IBM PC or compatible, the serial port is a male 9 pin or 25 pin connector. The wiring is different for each type of
connector.
For the 9 pin type connector on the back of an IBM PC or compatible, the serial port cable is wired 1:1 (straight through).
Although all pins can be wired, only pins 2, 3 and 5 need be connected. See the figure below:
To
PC
5
9
4
8
3
7
2
6
1
5
9
4
8
3
7
2
6
1
To
SG-100
Figure 6.2-1: RS232 hookup to a PC's 9 pin connector
The easiest way to cable to a 25 pin type connector on the back of a PC is to install a 25 pin to 9 pin adapter and use a 1:1 wired
cable. These adapters are available at most computer supply stores. Otherwise, you must use a cable that reverses pins 2 and 3 and
wires pin 5 to pin 7. (See diagram below).
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
To
PC
5
9
4
8
3
7
2
6
1
To
SG-100
Figure 6.2-2: RS232 hookup to a PC's 25 pin connector
To test the connection, run a terminal program and set the serial port parameters to 9600 baud, 1 start bit, 8 data bits, 1 stop bit,
and no parity. When the 630 is powered up, a text message is printed to the terminal. If you don’t see it, check your cabling. See
the following section for instructions on checking your connection on a PC using HyperTerm. Also, press Mode then Offset and
verify that the 630 baud rate is set to 9600.