Network Control And Communication; Serial Pin Connections - Teledyne D series Installation And Operation Manual

D Series Syringe Pumps
Section 8 Serial Interface
8.2 Network Control and
Communication
8-2
Network communications are always initiated by the network
controller, which is typically a computer. Messages from the
instruments are in response to messages from the network con-
troller. All information on the network is transmitted as groups
of ASCII characters called frames. The message frames contain
the origin of the message, the destination of the message, and a
checksum to verify the validity of the message.
Each instrument is provided with a method of selecting unit
identification numbers and a baud rate. For proper operation,
each instrument must be set to a unique unit identification
number (see Section ). It is also important that each unit's baud
rate is set to the same speed. Possible baud rates are 1200 and
19200. Other baud rates of 300, 1200, 2400, 4800, 9600, 19200,
38400, 57600, and 115200 are supported by the D Series pumps
but are not part of the Teledyne Isco defined communications
standard.
Electrical standards are RS-232-C; connector pin usage is out-
lined in Table 8-1. Characters consist of 1 start bit, 8 data bits
(low order first with 8
There is no parity bit used. All characters will be printable ASCII
characters. Control characters (0-1FH) are ignored except for car-
riage return (0DH).
The serial unit number and baud rate can be changed from the
default values through the MENU key. Select SERIAL under the
menu; and adjust the values using the softkeys.
Connecting devices to energized circuits may cause
personal injury or property damage. Power must be
removed from the pump before connecting external
devices.
Table 8-1 External control connector

serial pin connections

Pin No. Name
1 CHASSIS GROUND
2 RECEIVE
3 TRANSMIT
4 REQUEST TO SEND
5 CLEAR TO SEND
6 +11 VDC
7 COMMON
8 +11 VDC
th
bit always set to zero), and 1 stop bit.
WARNING
Use
Used to connect to the shield of the
interconnect cable.
Serial interface data input. Standard
RS-232-C signal levels.
Serial interface data output.
Standard RS-232-C signal levels.
RTS chain - RS-232-C input is buff-
ered and connected to pin 21.
CTS buffered RS-232-C output of pin
25 input.
DATA SET READY is held on.
Signal common for all signals.
DATA CARRIER DETECT is held on.