Rs-232 And Rs-422 Serial Interfaces - IBM 6400 Setup Manual

Chapter 5

RS-232 And RS-422 Serial Interfaces

RS-232 And RS-422 Serial Interfaces
NOTE: The RS-232 and RS-422 serial interface circuit characteristics are
The RS-232 and RS-422 serial interfaces enable the printer to operate with bit
serial devices that are compatible with an RS-232 controller. The input serial
data transfer rate (in baud) is selectable from the printer's control panel. Baud
rates of 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200
baud rates are available.
NOTE: If you select a baud rate that is greater than 19200, you may need to
The input format consists of a single start bit, 7 or 8 data bits, and one or two
stop bits. The number of data bits is determined by printer configuration. The
data bits are interpreted with the least significant bit first. Parity checking is
determined by printer configuration options selected from the operator panel.
The printer interface uses a first-in/first-out buffer. The asynchronous
interface accepts data as it is provided by the host. The length of the data
cable from the host computer to the printer must not exceed 50 feet (15
meters) for RS-232 interfaces and 4000 feet (1220 meters) for RS-422
interfaces. (A copper conductor, twisted-pair telephone cable with a shunt
capacitance of 16 pF/foot [52.5 pF/meter] terminated in a 100 ohm resistive
load must be used for the RS-422.)
RS-232
Table 5. RS-232 Serial Interface Connector Pin Assignments
Input Signals
Signal Pin
Receive Data (RD)
Clear To Send (CTS)
Data Set Ready (DSR)
Data Carrier Detect
(DCD)
210
compatible with the Electronic Industry Association Specifications
EIA-232-E and EIA-422-B.
use RS-422 to prevent data loss. You may also need to increase the
Buffer Size in K parameter from the default
(1 Kbyte) to improve performance.
Output Signals
Signal
3 Transmit Data (TD)
5 Request To Send (RTS)
6 Data Terminal Ready
(DTR)
8
Miscellaneous
Pin Signal
2 Chassis Ground
4 Signal Ground
20
Pin
1
7