Specifications

Communications Model 181 Series 180 Programmer’s Guide
TransAct Technologies________________________________
Page 8 - 2 09/26/2000
DTR/DSR PROTOCOL
The DTR signal is used to control data transmission to the printer. It is driven
High when the printer is ready to receive data and driven low when it cannot
accept any more data. The host will transmit data to the printer when it
recognizes the state of the printers DTR signal is high.
XON/XOFF PROTOCOL
ASCII characters coordinate the information transfer between the printer and the
host system. The printer sends an ASCII DC1(11Hex,XON) character when it is
ready to receive data and it sends an ASCII DC3(13Hex,XOFF) character when
it cannot accept any more data. The host system must monitor the communication
link in order to send data at the appropriate times.
RS-232C TECHNICAL SPECIFICATIONS
This section describes the pin settings for the connectors and the RS-232C
interface parameters.
CONNECTORS
The following table shows the RS-232C communication connector and pin
assignments. The connector is a 9-pin male D-shell connector and is located in
the hollow cavity under the printer.
Pin # Signal Name Signal Function PC Host Cross
Connect Pin #
1 Received line Signal
Detector
NOT USED
2 Serial Receive input signal to receive data from the host
system
3 Tx
3 Serial Transmit output signal sending data to the host system 2 Rx
4 Data Terminal Ready output signal to float control the host 6 DSR
5 Ground Logic Ground 5 GND
6 Data Set Ready input signal to float control the printer 4 DTR
7 Request to Send output signal to float control the host. 7 CTS
8 Clear to Send input signal to float control the printer 6 RTD
9 Ring Indicator NOT USED