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

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 operator panel. Baud
rates of 600, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600, and 115,200 are
available.
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.
Table 5–1. RS–232 Serial Interface Connector Pin Assignments
Input Signals
Signal
Received Data (RD)
Clear To Send (CTS)
Data Set Ready (DSR)
Data Carrier Detect (DCD) 8
Table 5–2. RS–422 Serial Interface Connector Pin Assignments
Input Signals
Signal
– Receive Data (–RD)
+ Receive Data (+RD)
compatible with the Electronic Industry Association Specifications
EIA–232–E and EIA–422–B.
Output Signals
Pin Signal
3 Transmit Data (TD)
5 Request To Send (RTS)
6
Data Terminal Ready (DTR) 20
Output Signals
Pin Signal
15 – Transmit Data (–TD)
17 + Transmit Data (+TD)
Miscellaneous
Pin Signal
2 Chassis Ground
4 Signal Ground
Miscellaneous
Pin Signal
19 Chassis Ground
25 Signal Ground
Chapter 5. Printer Interfaces
Pin
1
7
Pin
1
7
5–3